The chemical formula for propane is: CH3CH2CH3 Calculate the molar mass of propane. Round your answer to 2 decimal places.
Answer:
44.11 g/mol
Explanation:
In order to calculate the molar mass of any molecule, we need to add the molar mass of each atom that compounds it:
Molar Mass of C₃H₈ = (Molar Mass of C) * 3 + (Molar Mass of H)*8Molar Mass of C₃H₈ = (12.01) * 3 + (1.01) * 8Molar Mass of C₃H₈ = 44.11 g/molThe molar mass of propane is thus 44.11 g/mol.
Copper metal reacts with nitric acid according the equation below 3 Cu (s) +8 HNO 3(aq) -...m+3 Cu^ 2+ (aq)+2NO (g) +6 NO 3 (aq)+4 H 2 O 0 What mass of NO (g) will be produced if 8.96 g of copper are reacted wtih excess nitric acid. Be sure to include units.
Answer:
i think it is NO2 and +6 NO 6 that's all I have
Which reaction below is a physical change?
a. CH4(g) + 2O2(g) → CO2(g) + 2HsO(l)
b. CaO(s) + H2O(l)→ Ca(OH)2(s)
c. H2O (l) → H2O(s)
D. 2HsO (l) → 2H2(g) + O2(l)
Answer:
c. H₂O (l) → H₂O(s)
Explanation:
The correct answer is option C: The molecular formulas for the substance(s) on the left side of the equation and on the right side of the equation are identical. This means that there was not a chemical change, but a physical one.
In this concrete example, what happened was a change of states of matter: from liquid (l) to solid (s).
Other reactions have different molecular formulas on both sides of the equation, thus they represent chemical changes.
which of the following is a good conductor of electricity?
iron
pure water
paper
wood
please help!!!!!
Answer:
Explanation:
Iron is the correct answer
Which of the following are in our solar system? Select all answers that apply.
A the star Canis Majoris
B Jupiter's Moons
C Andromeda Galaxy
D Earth
E Asteroid Belt
Answer:
hola como esats UwU
Explanation:
yo bien y tu? UwU
What must products equal in a chemical equation
Answer:
Reactants
Explanation:
In a chemical reaction, reactants must react to form products, so products are equal to the reactants
A gas sample has a volume of 185 mL at 45°C. What is its volume at 109°C?
Answer:
342 mL
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 185 mL
Initial temperature (T₁) = 45 °C
Final temperature (T₂) = 109 °C
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 45 °C
Initial temperature (T₁) = 45 °C + 273
Initial temperature (T₁) = 318 K
Final temperature (T₂) = 109 °C
Final temperature (T₂) = 109 °C + 273
Final temperature (T₂) = 382 K
Finally, we shall determine the final volume of the gas as follow:
Initial volume (V₁) = 185 mL
Initial temperature (T₁) = 318 K
Final temperature (T₂) = 382 K
Final volume (V₂) =?
V₁/T₁ = V₂/T₂
285 / 318 = V₂ / 382
Cross multiply
318 × V₂ = 285 × 382
318 × V₂ = 108870
Divide both side by 318
V₂ = 108870 / 318
V₂ ≈ 342 mL
Therefore, the new volume of the gas is 342 mL
Answer:
342 mL
Explanation:
Hope this helps
An Introduction To Chemistry
Answer Sheet
Please provide your answer in the answer sheets!
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An Introduction To Chemistry
1. During his distinguished career this scientist received two unshared Nobel prizes. One for chemistry and one for peace.
Alfred Nobel
Marie Currie
Linus Pauling
Albert Einstein
2. The study of matter and the changes it undergoes describes the science of ______.
physics
mathematics
chemistry
biology
3. The _________ is the fundamental unit of matter.
atom
compound
nucleus
proton
4. The atom is composed of three subatomic particles known as _____, ____ and _______.
neutrals, electives and peeons
quarks, alpha rays and xenons
electrons, protozoans and electricals
protons, neutrons and electrons
5. Protons are _________ charged particles found in the nucleus of an atom.
neutrally
positively
negatively
brighltly
6. Electrons are ________ charged particles that orbit the nucleus of an atom.
negatively
positively
neutrally
brighltly
7. Neutrons are ________ particles found in the nucleus of an atom.
negatively charged
positively charged
uncharged
brightly
8. An ion is an atom or molecule that ___________.
is electrically neutral
is composed of two or more elements
is man made
carries a charge
9. Which of the following chemical species is a cation?
Cl-
H+
Au
HCO3-
10. The atomic number of an atom or element describes the number of _______.
electrons orbiting the nucleus
neutrons in the nucleus
alpha particles in the nucleus
protons in the nucleus
11. Mass is proportional to the number of _________ that make up an object.
atoms
cells
neutrons
protons
12. Weight is best described as _____________.
the number of atoms in an object
the pull of gravity on matter
the electrical charge on an ion
the number of electons in an atom
13. Atoms of any one type of element, such as gold, all posess the same number of _______.
electrons
neutrons
protons
nuclei
14. There are currently _______ known elements.
65
98
112
152
15. Element _______ are one or two letter abbreviations for the names of the elements.
numbers
atomic numbers
symbols
characters mass
16. Two or more elements that combine as a result of a chemical reaction form _____.
atoms
ions
mixtures
compounds
17. An example of a mixture would be __________.
a bar of pure gold
the air we breathe
sodium chloride salt
pure water
18. The three states of matter are ________, ________ and _________.
atoms, molecules and compounds
atoms, compounds and mixtures
solids, liquids and gases
solids, gases and steam
19. The least dense and most energetic of the three states of matter is ____.
the gaseous state
the liquid state
the solid state
the elemental state
20. All measurements must consist of both ____________.
a size and a shape
a price and a volume
a number and a unit
a color and a number
21. Density is a physical property that refers to _____________.
the number of atoms in an object
the weight of an object
the mass of an object relative to its volume
the weight of an object relative to its cost
22. A kilogram is equal to ________ grams.
1
10
100
1,000
23. There are _______ centimeters in a meter.
1
10
100
1,000
24. Measurements are _________ because of equipment error and human judgment.
useless
uncertain
perfect
inaccurate
25. The number 221.5 contains ______ significant figure(s).
1
2
3
4
26. The number .001 contains ______ significant figure(s).
1
2
3
4
27. The number 226 would be scientifically noted as ______.
226
2.26 x101
2.26 x 102
22.6 x 101
28. The figure .005 would be scientifically noted as _______.
5 x 10-1
5 x 10-2
5 x 10-3
5 x 10-4
29. Elements or atoms are arranged on the periodic table in the order of increasing ________.
atomic mass
atomic weight
atomic number
atomic symbols
30. A substance that weighs 10 grams and has a volume of 2 cm3 would have a density of ______.
5 g/cm3
10g/cm3
2g/cm3
15g/cm3
31. The terms Kelvin, Celsius and Fahrenheit all correspond to units of _______.
density
hardness
volume
temperature
32. The ________ is the SI standard unit for measurements of length.
cetimeter
foot
meter
yard
33. One kilogram is equal to approximately ________ pounds.
1.2
2.2
3.2
4.2
1. C. Linus Pauling
2. C. chemistry
3. A. atom
4. D. protons, neutrons and electrons
5. B. positively
6. A. negatively
7. C. uncharged
8. D. carries a charge
9. C. Au
10. D. protons in the nucleus
11. A. atoms
12. B. the pull of gravity on matter
13. C. protons
14. C. 112
15. C. symbols
16. D. compounds
17. C. sodium chloride salt
18. C. solids, liquids, and gases
19. A. the gaseous state
20. C. a number and a unit
21. B. the weight of an object
22. D. 1,000
23. C. 100
24. B. uncertain
25. D. 4
26. A. 1
27.C. 2.26 x 102
28. C. 5 x 10-3
29. C. atomic number
30. A. 5 g/cm3
31. D. temperature
32. C. meter
33. B. 2.2
Vines most successfully compete for sunlight in tropical rainforests by _______.
a.
climbing up into the canopy
b.
strangling the trees they grow on
c.
having broader leaves that absorb more light
d.
having thick, woody stems
Answer:
climbing up into the canopy
Explanation:
Dust and particulates released in the home may cause
Lung cancer
Increased allergies and respiratory problems
Nausea
Answer:
b) increased allergies and respiratory problems.
Explanation:
i hope this helps!
have a great rest of your day!
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Answer:
Human health effects of dust relate mainly to the size of dust particles. Dust may contain microscopic solids or liquid droplets that are small enough to get deep into the lungs and cause serious health problems. Large particles may irritate the nose, throat and eyes. ... Dust from soil can irritate the respiratory tract.
b. increased allergies and respiratory problems
What is the law of conservation or matter? Please helppppppp.....no links no trolling otherwise I'll report!
May give brainliest to first correct. :)
Answer:
In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
Explanation:
hope this helps :)
(a)0.444 Mol of COCl2 in 0.654 L of solution
(b) 98.0 gram of phosphoric acid, H3PO4, in 100 L of solution
(c) 0.2074 g of calcium hydroxide, Ca(OH)2 in 40.00 mL of solution
(d)10.5 kg of Na2AO4.10H2O in 18.60 L of solution
(e) 7.0 x 10-3 Mol of l2 in 100.0 ml of solution
(f) 1.8 x 104 mg of HCL in 0.075 of solution
Answer is in a photo. I can only upload it to a file hosting service. link below!
bit.[tex]^{}[/tex]ly/3a8Nt8n
What mass of Na2SO4 (sodium sulfate) is needed to make 2.5 L of 2.OM
solution?
O 1789
O 2849
O 7109
O 356 g
If x represents the molar solubility of Ca(OH)2 , what is the correct equation for the K sp ?
Ksp=x^2
Ksp=2x^3
Ksp=4x^3
Ksp=x^3
Answer:
Ksp = 4x³
Explanation:
Step 1: Write the reaction for the solution of calcium hydroxide
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
Step 2: Make an ICE chart
Let "x" be the molar solubility of calcium hydroxide.
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
I 0 0
C +x +2x
E x 2x
Step 3: Write the expression for the solubility product constant (Ksp)
The solubility product constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients.
Ksp = [Ca²⁺] × [OH⁻]² = x × (2x²) = x × 4x² = 4x³
if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
Solubility product constant Ksp:
It is the equilibrium constant for a solid substance that are dissolved in an aqueous solution. It expresses how much a solute is dissolved in solution.
The reaction of calcium hydroxide for the solution
[tex]\bold {Ca (OH )_2(s) \rightarrow Ca^2^+(aq) + 2 OH^-(aq)}[/tex]
1 mole of calcium hydroxide is dissociate into 1 mole of calcium ion and 2 moles of Hydroxil ion.
The Ksp equation for the solution,
[tex]\bold {Ksp =[Ca^2^+][ OH^-]^2}\\[/tex]
If [tex]x[/tex] represents molar solubility,
[tex]\bold {Ksp =[x][ x]^2 = x^3}\\[/tex]
Therefore, if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
To know more about Ksp,
https://brainly.com/question/4736767
Write down at least one example of ketone with its IUPAC name
Answer:Propanone is the IUPAC name for acetone, and butanone is the name for ethyl methyl ketone.
Explanation:
what is a derived lipid
Answer: Derived lipids:
Hydrolysis product of simple and compound lipids is called derived lipids. They include fatty acid, glycerol, sphingosine and steroid derivatives. Steroid derivatives are phenanthrene structures that are quite different from lipids made up of fatty acids.
Explanation:
A biochemist carefully measures the molarity of salt in 23.5mL of photobacterium cell growth medium to be 7.73 mM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 4.78mL. Calculate the new molarity of salt in the photobacterium cell growth medium.
Round each of your answers to 3.
Answer: The new molarity of salt in the photobacterium cell growth medium is 38.0 mM
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated solution = 7.73 mM
[tex]V_1[/tex] = volume of concentrated solution = 23.5 ml
[tex]M_1[/tex] = molarity of diluted solution = ?
[tex]V_1[/tex] = volume of diluted solution = 4.78 ml
Putting in the values we get:
[tex]7.73\times 23.5=M_2\times 4.78[/tex]
[tex]M_2=38.0mM[/tex]
Therefore, new molarity of salt in the photobacterium cell growth medium is 38.0 mM
how many liters are present in 31.998 g of O2?
Answer:
Explanation:
First calculate how many moles of O2 you have. O is 16g/mole, so O2 is 32g/mole. 50/32 = 1.5625 moles. 1 mole of any gas at stp is 22.4 liters.
1.5625 × 22.4 = 35 liters.
Its been 15 years since I graduated HS, and I still remember how to do this. Do your own homework next time and in 15 years you may be able to do the same.
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How many grams of MnCl2 need to be added to 5 liters of water to make a 0.25 M solution?
Answer:
I think it is 860 g MG Cl2
Explanation:
your welcome
how much alum product would be lost to the crystallization solution if you had 42.5 ml of solution after filtration and the solubility of alum is approximately 2.63 g alum in 100 ml of 0 degrees celcius acidic water
Answer:
Total amount of alum lost = 0.5122 grams
Explanation:
Let the total volume of the solution be 100 mL
In 100 mL of solution, there is 2.63 gram of alum.
Out of this 100 mL solution, 42.5 mL is remaining.
Amount of alum in 42.5 mL solution is
[tex]\frac{42.5}{100} * 2.63 = 1.117\\[/tex] grams
Now the amount of alum lost is [tex]2.63 -1.117 = 0.5122[/tex] grams
On analysis of 3.4 mg of an organic compound, 8.03 g of CO2 and 3.34 g of H2O were obtained. The percentage composition of carbon and hydrogen in the compound are.......................... respectively
Answer: The percentage composition of carbon and hydrogen in the compound are 64.4 % and 10.9 % respectively
Explanation:
Mass of [tex]CO_2[/tex] = 8.03 g
Mass of [tex]H_2O[/tex]= 3.34 g
Molar mass of carbon dioxide = 44 g/mol
Molar mass of water = 18 g/mol
For calculating the mass of carbon:
In 44g of carbon dioxide, 12 g of carbon is contained.
So, in 8.03 g of carbon dioxide, =[tex]\frac{12}{44}\times 8.03=2.19g[/tex] of carbon will be contained.
For calculating the mass of hydrogen:
In 18g of water, 2 g of hydrogen is contained.
So, in 3.34 g of water, =[tex]\frac{2}{18}\times 3.34=0.371g[/tex] of hydrogen will be contained.
Mass of oxygen in the compound = (3.4) - (2.19+0.371) = 0.839 g
percent composition of C =[tex] \frac{\text{mass of C}}{\text{ Total mass}}\times 100= \frac{2.19}{3.4}\times 1000=64.4\%[/tex]
percent composition of H =[tex] \frac{\text{mass of H}}{\text{ Total mass}}\times 100= \frac{0.371}{3.4}\times 1000=10.9\%[/tex]
Thus the percentage composition of carbon and hydrogen in the compound are 64.4 % and 10.9 % respectively
Calculate the number of moles of NO in 4.10 x 1021 molecules of NO.
Answer:
.0068
Explanation:
You divided the number of molecules by 6.022*10^23 (Avagodros Number) to get the number of moles.
A/An ______ bond occurs when 2 atoms share electrons.
O ionic
O covalent
O James
O electrical
Answer:
convalent???????
Explanation:
sowwy if it wrong
Which of the following reactions best describes the acid-base properties of acetic acid (CH3COOH) in an aqueous solution? O CH3COOH(aq) + 4H2O(l) 4H30+ (aq) + C2024-(aq) (reversible reaction) O CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO-(aq) (reversible reaction) O CH3COOH(aq) + H2O(1) CH3C00* (aq) + OH(aq) (reversible reaction) -> H2O*(aq) + O CH3COOH(aq) + H2O() CH3COO-(aq) O CH3COOH(aq) + H2O(0) + OH(aq) -> CH3COO(aq)
Answer:
CH3COOH(aq) + H2O(l) ⇄ CH3COO-(aq) + H3O+(aq)
Explanation:
Acetic acid is a weak acid, so it only partially dissociates, hence the reversible reaction. Acids react with water to produce conjugate base and hydronium.
18. A 35.0 G piece of metal wire is heated and the temperature changes from 21°C to 52°C the specific heat of the metal is 0.900 J/G degrees Celsius how much energy was required to heat the metal please show work
Answer:
Q = 976.5 J.
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the heat in terms mass, specific heat and temperature change, we can write:
[tex]Q=mC(T_2-T_1)[/tex]
Thus, by plugging in the given data, we obtain:
[tex]Q=35.0g*0.900\frac{J}{g\°C} (52\°C-21\°C)\\\\Q=976.5J[/tex]
Regards!
copper chloride reacts with magnesium but magnesium chloride does not react with copper. Why is this?
Answer:
Mg is highly reactive as compared to that of Copper owing to its periodic position
Explanation:
MG lies in the second column of the periodic table while Cu lies in the 11th column of the periodic table from the left.
The elements in the first two columns are metallic in nature are highly reactive.
In CuCl2 solution, Mg being highly reactive replaces Cu but in MgCl2 solution, Cu being less reactive in nature do not replaces the Mg from the solution.
Help help help help help help
I have an experiment on a mouse, and this experiment includes arsenic ... but I don't know where to buy it. Please help me. What are the characteristics of arsenic? Please help
Answer:
Arsenic is a semi-metal. In its metallic form it is bright, silver-grey and brittle. Arsenic is a well-known poison. Arsenic compounds are sometimes used as rat poisons and insecticides but their use is strictly controlled.
Explanation:
You have a solution of NaOH that is 3.0 M. If you need 250 mL of a 1.5 M solution, what volume of the stock solution should you use?
Answer:
answer is 30 g!!!!!!!!!
Define What is boiling
Answer:
Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.
Explanation:
Hi