We want to solve Q = mcΔT for the liquid water; its change in temperature will tell us the amount of thermal energy that flowed out of the reaction. The specific heat, c, of water is 4.184 J/g °C.
Q = (72.0 g)(4.184 J/g °C)(100 °C - 25 °C) = 22593.6 J
Q ≈ 2.26 × 10⁴ J or 22.6 kJ (three significant figures).
state 5 uses of water in the diet
Answer:
It helps create saliva.
It regulates your body temperature.
It protects your tissues, spinal cord, and joints.
It helps excrete waste through perspiration, urination, and defecation.
It helps maximize physical performance
1.
What is the molarity of a 3.6 L solution with 104 g of sucrose?
Answer:
.084 M
Explanation:
Molar mass of sucrose = 342.3
The formula to find molarity is moles of solute / liters of solution
Since we need to turn grams to moles for this equation we do 104 / 342.3 = 0.304
Now we can use the equation listed above. .304 / 3.6 = 0.084 M
mes.
monthly
(Chp.3)
(40) The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find
the two numbers.
The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find the two numbers.
Solution:-Let the larger number be x
And, the square of the smaller number be 8x
ATQ ,x² − 8x = 180
⇒ x² − 8x − 180 = 0
⇒ x² − (18 − 10)x − 180 = 0
⇒ x² − 18x + 10x − 180 = 0
⇒ x (x − 18) + 10(x − 18) = 0
⇒ (x − 18) (x + 10) = 0
⇒ x − 18 = 0, x + 10 = 0
⇒ x = 18, x = −10
⇒ x = −10, 18
[tex] \therefore [/tex] Either, x = −10 and x = 18
x = 18 (Positive value)
Now, the square of the smaller number = 8x = 8 × 18 = 144
So, the square of the smaller number = [tex]\sqrt{144} [/tex] = 12
The two numbers are 18 and 12. [Answer]Tetrachloroethene, C2C14 is a solvent used in many dry cleaning processes.
Write the empirical formula for tetrachloroethene.
An empirical formula presents the atoms of all the elements with the most simplified whole number ratios. In other words, divide each subscript by their greatest common factor.
The greatest common factor of 2 and 4 is 2.
2/2 = 1
4/2 = 2
So, the empirical formula for tetrachloroethene is CCl₂.
HELP! What are 5 changes for testing out a fidget spinner no websites
Answer:
Explanation:
Can you explain a bit further? once u do, ill edit my answer and tell you :) But to use a fidget spinner, u have to put ur thumb at the bottom and index finger at the top, and spin it with you other fingers if thats what you meant
Calculate the volume in mL of 53.2 g of .251M solution of HCl.
Answer:
5.813 mL
Explanation:
You need to use the formula : vol = mass / molar mass x molarity
the molar mass of HCl is 36.46 and the problem gives you the rest of the equation
0.251M x 36.46 = 9.151
53.2g / 9.151 = 5.813 mL
*I don't know some of the units so that's why some of them are blank sorry
*I'm also sorry if this is wrong but it's what I did so..
what is the molarity of a solution that contains 4.42 moles of Rubidium nitrate in 3.0 liter solution
Answer:
The molarity of the solution is 1.473 [tex]\frac{moles}{liter}[/tex].
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species.
So, Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is determined by:
[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= 4.42 molesvolume= 3 LReplacing:
[tex]Molarity=\frac{4.42 moles}{3 L}[/tex]
Molarity= 1.473 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 1.473 [tex]\frac{moles}{liter}[/tex].
Chemistry help!
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Answer:
11.9 g of nitrogen monoxide
Explanation:
We'll begin by calculating the number of mole in 6.75 g of NH₃. This can be obtained as follow:
Mass of NH₃ = 6.75 g
Molar mass of NH₃ = 14 + (3×1)
= 14 + 3
= 17 g/mol
Mole of NH₃ =?
Mole = mass /molar mass
Mole of NH₃ = 6.75 / 17
Mole of NH₃ = 0.397 mole
Next, we shall determine the number of mole of NO produced by the reaction of 0.397 mole of NH₃. This can be obtained as follow:
4NH₃ + 5O₂ —> 4NO + 6H₂O
From the balanced equation above,
4 moles of NH₃ reacted to produce 4 moles of NO.
Therefore, 0.397 mole of NH₃ will also react to produce 0.397 mole of NO.
Finally, we shall determine the mass of 0.397 mole of NO. This can be obtained as follow:
Mole of NO = 0.397 mole
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO =?
Mass = mole × molar mass
Mass of NO = 0.397 × 30
Mass of NO = 11.9 g
Thus, the mass of NO produced is 11.9 g
explain why decomposition uses solar energy
Answer:
Without the sun's energy, biological life would not be able to exist to decompose. Many microbes and fungi do their best work out of direct sunlight.
In an ecosystem, microbes make use of solar energy to decompose dead plant and animals.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.
Learn more about ecosystem,here:
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According to the Law of Conservation of Energy, energy ______.
New concept cars in the Detroit Auto Show feature engines that burn hydrogen gas in air to produce water vapor. Suppose that fuel tank contains 150. L of H2 gas at 20.0 atm pressure at 25.0˚C. If all of this gas is burned, what mass (in grams) of water vapor is produced?
Answer:
247.2g
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information in this question, a fuel tank contains 150. L (V) of H2 gas at 20.0 atm (P) at 25.0˚C (T)
Temperature = 25°C = 25 + 273 = 298K
Using PV = nRT
20 × 150 = n × 0.0821 × 298
3000 = 24.4658n
n = 3000/24.4658
n = 122.62
n = 122.6mol
Using the formula, mole = mass/molar mass, to find the mass of H2 gas.
Molar mass of H2 = 1.008(2)
= 2.016g/mol
122.6 = mass/2.016
mass = 122.6 × 2.016
mass = 247.2g.
In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the
following could represent the mass of the products?
Answer:
26.6
Explanation:
what is the wavelength of a photon with an energy of 3.38 x 10-19J?
Answer:
C. 588 nm
Explanation:
Answer:
588 mm
Explanation:
PLEASE HELP SOMEONE PLEASEEEE
Answer:
the answer is b
hope this helps you!!
Have a lovely day!
-millie :D
What happens when Sulphuric acid is added to into Barium Chloride solution?
Answer:
please give me brainlist and follow
Explanation:
When dilute sulphuric acid is added to barium chloride solution, barium sulphate is formed as a precipitate and hydrogen chloride is formed in aqueous solution.
?
9. Oxygen will have a positive oxidation number
when combined with
(1) fluorine
(3) bromine
(2) chlorine
(4) iodine
in
Answer:
Flourine
Explanation:
Oxidation number will be +1 for oxygen and -1 for Flourine
If you can solve these thank you I will mark brainly.ASAP
Answer:Number 2 might be the second one
Explanation:
A substance that catches fire and burns in air is said to be
Answer:
combustible.
Explanation:
The substances which burn in air are called combustible. Oxygen (in air) is essential for combustion. During the process of combustion, heat and light are given out.
Hope this helped!!!
Answer: flammable
Explanation:
The driver of an 1,840 kg race car applies the brake to come to a complete stop. If the car
accelerates at -3.4 m/s2 what is the net force acting on the race car?
a) -541 N
b) 630 N
c) -1.8 N
d) -6,256 N
Push and pull subjected to an object is called force and is given in newtons. The net force acting on the race car is -6,256 N.
What is force?Force is the product of the mass of the object in kg and the acceleration in meters per second square. It is given by the formula:
[tex]\rm F = m \times a[/tex]
Given,
Mass of the race car = 1,840 kg
Acceleration of the race car = -3.4
Substituting values in the above equation:
[tex]\begin{aligned} \rm F &= \rm m \times a \\\\&= 1840 \times -3.4\\\\&= -6,256 \;\rm N \end{aligned}[/tex]
Therefore, option D. -6,256 N is the force acting on the car.
Learn more about force here:
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The combustion of ethene,C2H4,is an exothermic reaction. Use the information below to determine the amount of energy given off when 1000g of ethene is conbusted C2H4+3 O2-> 2CO2 + H20
Answer:
[tex]Q=-50,307kJ[/tex]
Explanation:
Hello there!
In this case, since following reaction:
C2H4+3 O2-> 2CO2 + 2H2O
Has an enthalpy of combustion of ethene is about -1411.1 kJ/mol (can be found on goo gle), it is possible to calculate the total amount of energy that is released when 1000 grams of ethene are burned as shown below:
[tex]Q=-1411.1 \frac{kJ}{molC_2H_4} *\frac{1molC_2H_4}{28.05gC_2H_4}*1000gC_2H_4 \\\\Q=-50,307kJ[/tex]
Best regards!
Write your question here (Keep it simple and clear to get the best answer) Explain why ammonia gas is not collected over water
Answer:
Because of the solubility of ammonia gas in water, it is not collected over water.
Explanation:
Gases prepared in the laboratory are often collected by a technique called water displacement. A bottle is filled with water and placed upside-down in a trough or container of water. The reaction flask is connected to the bottle of water by means of a rubber or glass tubing which is fed under the water bottle . As the gas is produced in the reaction flask, it enters the bottle and displaces the water in it. When the bottle is full of the gas, it is then sealed. The volume of gas in the bottle can be used to determine the amount of gas produced in the reaction. Usually, the gas collected is present in addition to water vapor in the bottle.
Gases that are collected over water must not react with or dissolve in water.
Ammonia gas is very soluble in water. The solubility is due to the readiness with which it forms hydrogen bonds with water to produce aqueous ammonia, NH₃.H₂O.
Aqueous ammonia ionizes partially to produce ammonium ions, NH₄+ and hydroxide ions, OH-. Because of the solubility of ammonia gas in water, it is not collected over water.
Determine the molar mass of :
1. H20
2. Co2
3.NaCl
Answer:
1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.
2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
3 Chemical abbreviation for sodium chloride (table salt)
I need help with this question.
Instruction : Answer the following questions using the given options.
Questions :
1. The reaction between an acid and a base is an example of ___ reaction ?
a. Valence
b. Endothermic reaction
c. Chemical reaction
d. Exothermic reaction
2.The following are the factors affecting the rate of a chemical reaction except ___
a. catalyst
b. nature of reactants
c. activation energy
d. lights
3.___ gives a dense white fume when in contact with HCL
a. propane
b. ammonia
c. tetraoxosulphate(vi) acid d. water
Explanation:
The reaction between an acid and a base is known as a neutralisation reaction.
Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...
Physical state of the reactants and surface area. ...
Temperature. ...
Presence of a catalyst.
ammonia
An alkaline gas which produces dense white fumes when reacted with HCl gas is ammonia and fumes are of compound ammonium chloride.
BRAINILIEST PLEASE
2 H2 (g) + O2 (g) --> 2 H2O (l)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
2H2(g]+O2(g]→2H2O(l]]. Notice that the reaction requires 2 moles of hydrogen gas and 1
Explanation:
pb(No3)2(aq) +2KCI(aq)---PbCl2(s)+KNO2(aq). how many grams of PbCl2 solution will react with a 0.46 L of a 0.101m KCI solution
Answer:
6.3986g
Explanation:
The balanced chemical equation of this reaction is as follows:
Pb(NO3)2(aq) + 2KCl (aq) → PbCl2(s) + 2KNO3(aq)
In this equation, 2 moles of KCl solution will produce 1 mole of PbCl2.
To calculate the number of moles of PbCl2 produced, we use the formula:
Molarity = number of moles (n) ÷ volume (V)
0.101 = n/0.46
n = 0.046mol of KCl
If 2 moles of KCl solution will produce 1 mole of PbCl2
Then, 0.046mol of KCl will be react to produce (0.046 × 1/2) of PbCl2
0.046 × 1/2 = 0.023mol of PbCl2
To find the mass of PbCl2 using mole = mass ÷ molar mass
Molar mass of PbCl2 = 207.2 + 35.5(2)
= 207.2 + 71
= 278.2g/mol
0.023 = mass/278.2
mass = 6.3986g
Answer:
Can you help me with other question please
Find the number of Grams
Show all the steps you did to arrive at your answer.
4.00 moles of Cu(CN)2
Answer: 462 g
Explanation:molar mass is M= 63.55 +2·(12.01+14.01)= 115.59 g/mol.
Mass m= n·M = 4.0 mol·115.59 g/mol= 462.36 g
From the balanced reaction below, when you have 3.33 moles of (NH4)2Cr2O7, how many grams of N2 will be produced
Answer:
[tex]m_{N_2}=93.3gN_2[/tex]
Explanation:
Hello there!
In this case, for this stoichiometry-based problem, it is firstly necessary to realize that the decomposition of ammonium dichromate is given by:
[tex](NH_4)_2Cr_2O_7(s)\rightarrow N_2(g)+4H_2O(l)+Cr_2O_3(s)[/tex]
Thus, since the mole ratio between ammonium dichromate and the gaseous nitrogen (molar mass = 28.02 g/mol) is 1:1, we can compute the produced mass of the latter via stoichiometry as shown below:
[tex]m_{N_2}=3.33mol(NH_4)_2Cr_2O_7*\frac{1molN_2}{1mol(NH_4)_2Cr_2O_7}*\frac{28.01gN_2}{1molN_2}\\\\ m_{N_2}=93.3gN_2[/tex]
Best regards!
Which One Is the Wrong One?
Answer:
I would say the second one it's the wrong
When hydrogen peroxide (H2O2) is used in rocket fuel, it produces water and oxygen (O2): Can someone help with parts B and C?
Answer:
Explanation: A foam forms when bubbles of a gas are trapped in a liquid or solid. In this case oxygen is generated when hydrogen peroxide breaks down into oxygen and water on contact with catalase, an enzyme found in liver. Enzymes are special protein molecules that speed up chemical reactions.
You have been shipwrecked on a deserted island with no running water/fresh water, you have your clothes and a plastic bag containing your phone out of
charge and some sunscreen) How are you going to survive and escape?
Answer:
i have no clue
Explanation: