Answer:
approximately 1.772 grams
Explanation:
molecular mass of AlCl3 is 132 g per mole and of Al(OH)3 is 78 g per mole
the reaction is
AlCl3 + 3 NaOH ---> Al(OH)3 + 3 NaCl
from the reaction it is clear that 1 mole AlCl3 makes 1 mole Al(OH)3
implies 132g AlCl3 gives 78g Al(OH)3
Implies 3g AlCl3 gives
[tex]3 \times \frac{132}{78} = 1.772 \: g \: al(oh)3[/tex]
A solution contains 2.38 g of magnesium
chloride, MgCl2, in 500 cm3 of solution.
(a) Calculate the number of moles of
magnesium chloride in 500 cm3 of the
solution.
(b) What is the concentration of
(i) magnesium chloride in mol/dm3;
(ii) chloride ions in g/dm3?
Answer:
a. 0.0250 moles MgCl2
b. i. 0.0500mol MgCl2 / dm3
ii. 3.54g Cl-/dm3
Explanation:
a. In 500cm3, the mass of MgCl2 (Molar mass: 95.211g/mol) is 2.38g. The moles are:
2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2
b. The dm3 are (1000cm3 = 1dm3):
500cm3 * (1dm3 / 1000cm3) = 0.500dm3
Concentration is:
0.0250 moles MgCl2 / 0.500dm3
i. 0.0500mol MgCl2 / dm3
ii. Moles Cl-:
0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-
Mass Cl- -Molar mass: 35.45g/mol-:
0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions
1.77g Cl- / 0.500dm3:
3.54g Cl-/dm3
Substance D - It has a high melting and boiling point. The arrangement of its particles are closely packed. It cannot conduct electricity unless molten or dissolved in water. What type of element is substance D?
Answer:
ionic
Explanation:
because when in molten or dissolved in water ions are free to move and carry a charge however when in solid the ions are fixed in position so can't carry a charge.
Which would have a stronger attraction to the nucleus, the outer electrons of a carbon atom, or the outer electrons of an oxygen atom? Why?
Answer: Outer electrons because they revolve around the nucleus and can be multiple more than one
Explanation:
Hope it helps you you
-
2
Solid potassium chlorate decomposes to produce solid
potassium chloride and oxygen gas according to the balanced
equation: 2 KCIO
2 KCl + 3 O
What volume of oxygen gas, measured at 40.0°C and 85.4 kPa,
will be produced when 13.5 g of potassium chlorate is
decomposed?
Answer:
5 × 10^-4 L
Explanation:
The equation of the reaction is;
2KClO3 = 2KCl + 3O2
Number of moles of KClO3 = 13.5g/122.5 g / mol = 0.11 moles
From the stoichiometry of the reaction;
2 moles of KClO3 yields 3 moles of O2
0.11 moles of KClO3 yields 0.11 × 3/2 = 0.165 moles of oxygen gas
From the ideal gas equation;
PV= nRT
P= 85.4 × 10^4 KPa
V=?
n= 0.165
R= 8.314 J K-1 mol-1
T= 40+273 = 313K
V= 0.165 ×8.134 × 313/85.4 × 10^4
V=429.4/85.4 × 10^4
V= 5 × 10^-4 L
Can someone please solve this?
Answer:
Indirect (B)
Explanation:
When one facter increases the other decreases.
Answer:
INDIRECT- when one factor increases, the other decreases
how many moles are there in a 3.00M solution when you have 1.78L
Help me with chemmm!!!
srry the pic is not clear......
l cant see it.....
Which of the following best describes the bonding found within Al2O3?
Answer:
C). Electrostatic attractions between + and - charged ions.
Explanation:
They're electrostatic attractions because it is electrovalent bonding.
The bond type in alumina Al₂O₃ is described by the option C. Strong strong electrostatic force between positive and negative ions make this ionic compound.
What is alumina ?Alumina is one of the significant mineral of aluminum metal. Aluminum is 13th element in periodic table. Even though it is classified among the nonmetals Al shows metallic properties.
Al is an electropositive element with three valence electrons. Hence, it forms ionic compounds with highly electronegative elements such as oxygen.
Al easily reacts with oxygen to form the compound Al₂O₃. Al donates its two electrons with an oxygen atom at the end and one electron to the intermediate oxygen. The same for the second Al atom. Hence Al acquires +3 charge and O acquires -2 charge which binds them together.
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A sample of a certain isotope has an initial activity of 40,000 cpm. After 24.8 days, the activity is 2500 cpm. What is the half life of the isotope?
Answer:
6.2 days
Explanation:
initial activity = 40,000 cpm
one half-life = 20,000 cpm
two half-lives = 10,000 cpm
three half-lives= 5,000 cpm
four half-lives = 2500 cpm
24.8 days/4 half-lives = 6.2 days/ half-life
How does the uneven hearing of earth cause convection currents to form?
PLEASE ANSWER:)
Answer:
Because of the tilt of Earth on its axis, Earth's surface and atmosphere are unevenly heated by the Sun. Convection currents form in the atmosphere as warmer air rises and cooler air sinks.
Uneven hearing of earth cause convention currents to form because the Earth's surface and atmosphere are unevenly heated by the Sun
Help down below, thanks! <3
2.98 moles of H2 at 35°C and 2.3 atm are in a 32.8 L container. How many moles of H2 are in a 45.3 L container under the same conditions?
Answer:
4.12 moles
Explanation:
We can solve this problem with the Ideal Gases Law.
P . V = n . R . T
In our first case we have:
P = 2.3 atm
V = 32.8 L
n = 2.98 moles
T → 35°C + 273 = 308K
Let's replace data for the second case:
2.3 atm . 45.3L = n . 0.082 . 308K
n = (2.3 atm . 45.3L) / (0.082 L.atm/mol.K . 308K)
n = 4.12 moles
Answer:
4.11 moles of H₂ are in a 45.3 L container under the same conditions.
Explanation:
Avogadro's law establishes the relationship between the amount of gas and its volume when the temperature and pressure are held constant.
This law says that the volume of a gas under conditions of constant temperature and pressure is directly proportional to the number of moles of gas. That is, if the amount of gas is increased, the volume will increase; whereas if the amount of gas is decreased, the volume decreases.
Avogadro's law is expressed mathematically as the quotient between the volume and the amount of gas equal to a constant:
[tex]\frac{V}{n} =k[/tex]
Being 1 the initial conditions and 2 the final conditions, the following is satisfied:
[tex]\frac{V1}{n1} =\frac{V2}{n2}[/tex]
In this case:
V1= 32.8 Ln1= 2.98 molesV2= 45.3 Ln2= ?Replacing:
[tex]\frac{32.8 L}{2.98 moles} =\frac{45.3 L}{n2}[/tex]
Solving:
[tex]n2*\frac{32.8 L}{2.98 moles} =45.3 L[/tex]
[tex]n2=45.3 L*\frac{2.98 moles}{32.8 L}[/tex]
n2= 4.11 moles
4.11 moles of H₂ are in a 45.3 L container under the same conditions.
PLEASE HELP !
(In the column for the other reactants and/or products indicate whether they increase, decrease, or stay the same.)
Chemical Reaction:
A (g) + B (g) ←→ 3C (g)
Blue ← → Clear, Colorless
WHAT ARE THE:
Stress , Equilibrium Shift (right or left) , A (g) , B (g) , C (g) , What color?
1. Add A
2. Add B
3. Add C
4. Remove A
5. Remove C
Answer:
See Explanation
Explanation:
We must remember that when a constraint such as a change in concentration, pressure or temperature is imposed on a reaction system in equilibrium, the equilibrium position will shift in such as way as to cancel the constraint.
If more of A or more of B is added to the system, the equilibrium position will shift towards the right and the solution becomes clear and colorless.
If C is added to the system, the equilibrium position will shift towards the left and the solution colour turns blue.
If A is removed from the system, the equilibrium position is shifted towards the left and the solution once again turns blue.
If C is removed from the system, the equilibrium shifts towards the right and the solution turns clear and colorless
A molecule
B compound
C atom
D element
Answer:
D. Element.
Explanation:
Atoms form elements. Elements form molecules. Molecules form compounds.
What is ppm?
A. Concentration of a solute in grams/106 grams solution
B. Concentration of a solute in mol/L solution
C. Concentration of a solute in mol/kg solvent
D. Concentration of a solute in mol/mol solution
SUBMIT
HURRY!!!!
Answer:
This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.
if 1 mole of Zn reacts xompletely with 1 mole of I2, how many moles of ZnI2 will result?
Answer:
Zn + I₂ ⇒ ZnI₂Explanation:
The result of this reaction is only one mole of ZnI₂.Mole measure the number of elementary entities of a given substance that are present in a given sample. 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
The balanced equation is
[tex]Zn+ I_2\rightarrow ZnI2[/tex]
To see the mole of zinc iodide we need to have the knowledge of stoichiometry chemistry. So, the mole ratio among Zn, I[tex]_2[/tex] and [tex]ZnI_2[/tex] are 1:1:1 that means to produce 1 mole of ZnI[tex]_2[/tex], one of each Zn and I[tex]_2[/tex] are required.
Therefore 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].
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Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
compare with the temperature at the end of the change?
Temperature vs. Time
140
120
100
Temperature (°C)
ВО
80
40
20
Time (min) →
The temperature is always lower
The temperature is always the same.
The temperature is usually lower
O The temperature is usually higher
O
Answer:
always the same
Explanation:
e2020
Question 7 of 25
The diagram shows the direction trade winds blow below and above the
equator. What causes the trade winds to move at an angle rather than straight
toward the equator?
for Easterlies
Answer:
A. The Coriolis Effect bends them
Explanation:
The Coriolis Effect is a force that causes objects and other things that are not attached to the ground and which are moving over a large distance around the Earth such as the trade winds or air planes, to take an apparent curved path in their motion rather than moving in a straight line, due mainly to the rotation of the Earth
The Coriolis Effect is named after French mathematical physicist Gaspard-Gustave de Coriolis
The picture below shows what a driver sees in his side view mirror.
Indicate whether each statement is TRUE.
Select all that apply
REALLY URGENT
the mirror causes the van behind to appear further away than it really is.
The mirror allows the driver to see a wide area behind him.
The mirror causes the van behind to appear nearer than it really is.
The mirror causes the van behind to appear smaller than is really is
The mirror causes the van behind to appear larger than it really is.
35
Answer:
True- Mirror causes van to appear closer
Explanation:
Objects in the rear view mirror appear closer than they really are.
Vision and area are limited by the mirrors.
Why does water appear blue?
Answer:
Explanation:
Water is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see.
What should Peru do to improve science?
Answer:
scientists say the country has many home advantages for good research,but it desperately needs more government interest
A mixture of gases with a pressure of 900 mm Hg contains 20% of oxygen and 80% of nitrogen by volumeWhat is the partial pressure of the oxygen gas in the mixture?
A-45mmHg
B-180mmHg
C-210 mmHg
D-320 mmHg
Answer:
180 mmHg
Explanation:
Total volume of gases = 20% + 80%= 100%
Total pressure of gases = 900 mm Hg
Note that partial pressure of a gas = mole fraction × total pressure
Mole fraction of oxygen = 20/100
Hence partial pressure of oxygen= 20/100 × 900 mm Hg
partial pressure of oxygen= 180 mmHg
a chemist dissolves 0.564 moles of manganese (IV) oxide (MnO2) in water, and adds enough water to make 0.510 L of solution. Calculate the molarity of the solution.
Answer:
The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity is a measure of the concentration of that substance that is defined as the number of moles of solute divided by the volume of the solution.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex]
In this case
number of moles of solute= 0.564 molesvolume= 0.510 LReplacing:
[tex]molarity=\frac{0.564 moles}{0.510 L}[/tex]
Solving:
molarity= 1.1 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]
Which of the following could be predicted using Dmitri Mendeleev's periodic
table?
A. Number of neutrons
B. Atomic number
C. Atomic mass
D. Isotope number
The atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.
What is the Periodic Table?The Periodic Table of elements is an arrangement of elements in groups and periods based on increasing atomic number.
The first periodic table of elements was designed by Mendeleev.
The arrangement was based on increasing atomic mass of elements.
Therefore, atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.
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A sample of an unidentified compound contains 29.84% sodium, 67.49% chromium, and 72.67% oxygen. What is the compound's empirical formula? If the molar mass of the molecular formula is 523.96 g/mol, find the molecular formula.
Empirical Formula:
Molecular Formula:
Answer:
i would help i just dont know sorry
Explanation:
Which equation is an expression of the rate law?
A. PV = nRT
B.
* = AR
C. Rate = K[A]”[B]"
D. Keg
C D
[Al"B
Answer:
The answer to the question is C
The equation which is an expression of the rate law is: Rate = K[A]”[B]". Thus, the correct option will be C.
What is the rate law?A rate law of a chemical equation shows how the rate of a chemical reaction depends on the concentration of reactant molecules. For a chemical reaction such as aA → products, the rate law of the reaction generally has the form rate = k[A]ⁿ, where k is a proportionality constant which is called as the rate constant and n is the order of the reaction with respect to A reactant.
The rate law of a chemical reaction contains only one concentration term which is raised to the first power. Hence the rate constant of a reaction must have units of reciprocal seconds (s⁻¹) to have units of moles per liter per second for the reaction rate: M·s⁻¹ = M/s.
Therefore, the correct option will be C.
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HELP ME WITH THIS CHEMISTRY ILL MARK U THE BRAINLYEST
Answer:
pv=nrt solution re solve it
What change would increase the amount of solid solute able to be dissolved in liquid water?
The rise in kinetic energy with temperatures allows the solvent molecules to break apart the solute molecules that are held by intermolecular attractions.
What factors affect the solubility of solids in a liquid substance?There are two direct elements that influence solubility are
Temperature and Pressure.Temperature stimulates the solubility of both solids and gases, but the pressure is only concerned with the solubility of gases.
Thus, solids are dissolved in liquid water, the solubility increases with temperature.
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What do electrons Do in ionic bond? Do they transfer from metals to no metals or nonmetal to metals?
Answer:
electrons get transfered from metals to non metals in the formation of ionic bond.
metals have the tendency to lose electrons whereas non metals tend to stabilize by gaining electrons.
Do the middle one, will give brainliest
Answer:
it answer is (B)
the formula of toluene is C6H5CH3
it consists of a benzene ring with methyl group attached to it