1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
xxMikexx [17]
3 years ago
7

ObIel WiLll unt COl.. USSMS A certain chemical reaction releases 31.2 kJ/g of heat for each gram of reactant consumed. How can y

ou calculate what mass of reactant will produce 1080. J of heat? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. mass X ? Explanation Check ducabon ARghtsserved T of Ue Phacy The I'm esc
Chemistry
2 answers:
Maksim231197 [3]3 years ago
7 0

Answer:

1. The expression is: m=\frac{E}{\Delta _rH}

2. The computed mass is: m=0.0346g

Explanation:

Hello,

In this case, we know the so called enthalpy of reaction whose symbol and value is shown below:

\Delta _rH=31.2\frac{kJ}{g}

In addition, we know that the energy released by the involved reactant is:

E=1080 J

Therefore, the expression to compute the required mass, based on the given units is:

m=\frac{E}{\Delta _rH}

Finally, the computed mass turns out:

m=\frac{1080J*\frac{1kJ}{1000J} }{31.2\frac{kJ}{g}} \\m=0.0346g

Best regards.

aleksandr82 [10.1K]3 years ago
5 0

Answer:

The expression to calculate the mass of the reactant is m = \frac{1.080kJ}{31.2kJ/g}

Explanation:

<em>The amount of heat released is equal to the amount of heat released per gram of reactant times the mass of the reactant.</em> To keep to coherence between units we need to transform 1,080 J to kJ. We do so with proportions:

1,080J.\frac{1kJ}{10^{3}J } =1.080kJ

Then,

1.080kJ=31.2\frac{kJ}{g} .m\\m = \frac{1.080kJ}{31.2kJ/g}

You might be interested in
Turbines are 100 percent efficient. True False
max2010maxim [7]
False because there’s only 60% turbulence 20% heat 20% sound
6 0
3 years ago
Read 2 more answers
Based on these ideas, what are the pro's and con's for both Sexual Reproduction and Asexual reproduction?
Svetradugi [14.3K]
Asexual
Pro:
1. inexpensive to make offspring (usually make a lot at a time and not invest a lot of time in raising them).
2. Do not need a mate to reproduce.
3. Can rapidly expand a population
Con:
1. genetically identical- prone to extinction because once a parasite has evolved to attack a specific genotype, it can kill them all.
2. Lineages usually don't last longer than a couple thousand years

Sexual:
Pros:
1. Genetically unique- so more likely to create a "successful" offspring
2. Lineages more likely to last hundreds of thousands of years

Cons:
1. More effort into creating offspring- require more parental effort
2. STD's- easily to pass
3. need to find a mate or else won't be successful as an organism.

Hope this helps you.
6 0
3 years ago
CAN SOMEONE PLEASE HELP ME I DON’T UNDERSTAND :(
masya89 [10]

Answer:

A supersaturated solution

6 0
3 years ago
Problem Page A gas made up of atoms escapes through a pinhole 0.225 times as fast as H2 gas. Write the chemical formula of the g
Tcecarenko [31]
To determine what gas is this, we use Graham's Law of Effusion where it relates the rates of effusion of gases and their molar masses. We do as follows:

r1/r2 = √(M2 / M1)

Let 1 be the the unkown gas and 2 the H2 gas.

r1/r2 = 0.225
M2 = 2.02 g/mol

0.225 = √(2.02 / M1)
M1 = 39.90 g/mol

From the periodic table of elements, most likely, the gas is argon.
5 0
3 years ago
Read 2 more answers
Please Help Me!
avanturin [10]

Answer:

B) Cu(s) is metal that reacts spontaneously with NiCl2(aq).

4 0
3 years ago
Read 2 more answers
Other questions:
  • Nonmetals rarely lose electrons in chemical reactions because?
    11·1 answer
  • Minerals are very useful to us. Which of the following is a false statement? Question options: Pyrite is an ore of gold and is u
    15·1 answer
  • a certain compound was found to contain 54.0 g of carbon and 10.5 grams of hydrogen. its relative molecular mass is 86.0. find t
    13·1 answer
  • Two moles of propene (c3h6) gas react with nine moles of oxygen (o2) gas to produce six moles of carbon dioxide gas (co2) and si
    14·2 answers
  • Which may be true for a substance that absorbs energy?
    8·1 answer
  • When you add the metal the volume increases from 25.0 to 28.9 how would you find the volume of the metal?
    10·1 answer
  • Choose the correct coefficients for the equation? ____NaCI&gt;____Na+___C12​
    14·1 answer
  • 3) Rubidium reacts with rubidium nitrate to produce rubidium oxide and nitrogen gas
    7·1 answer
  • Which chemical equation is balanced.​
    12·1 answer
  • A chemist uses hot hydrogen gas to convert chromium(III) oxide to pure chromium. How many grams of hydrogen are needed to conver
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!