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GenaCL600 [577]
3 years ago
13

10. When a piece of steel wool is burned it gains mass. Which explanation is consistent with the law of conservation of mass?

Chemistry
1 answer:
frez [133]3 years ago
4 0

Answer:

Oh come on. Look at all - then look at A.

Explanation:

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A mixture of water and graphite is heated to 600 k in a 1 l container. when the system comes to equilibrium it contains 0.15 mol
Lunna [17]
(missing in Q) : Calculate the concentration of CO & H2 & H2O when the system returns the equilibrium???

when the reaction equation is:

C(s) + H2O(g)  ↔ H2(g) + CO(g) 

∴ Kc = [H2] [CO] / [H2O]

and we have Kc = 0.0393 (given missing in the question)

when the O2 is added so, the reaction will be:

2H2(g) + O2(g) → 2H2O(g)

that means that 0.15 mol H2 gives 0.15 mol of H2O

∴ by using ICE table:

            [H2O]          [H2]        [CO]

initial 0.57 + 0.15      0               0.15

change  -X                +X              +X

Equ   (0.72-X)             X            (0.15+X)

by substitution:

0.0393 = X (0.15+X) / (0.72-X)  by solving for X

∴ X = 0.098 

∴[H2] = X = 0.098 M

∴[CO] = 0.15 + X
 
           = 0.15 + 0.098 = 0.248 M

∴[H2O] = 0.72 - X

             = 0.72 - 0.098

             = 0.622 M


8 0
3 years ago
Why is mRNA able to leave the nucleus and not DNA?
valentina_108 [34]
Mrna is a single strand but DNA is a double helix. (mrna is smaller)
8 0
3 years ago
If you are correct you get a brainless
m_a_m_a [10]

Answer:

I Think it might be A! I hope I am right!

3 0
3 years ago
What is the potential energy of a 2-kg vase sitting on a table with a height of 1<br> meter?
lisov135 [29]

"20 J" is the "Potential Energy" of "vase" on the table.  

<u>Explanation</u>:

The body possess some energy according to the position of the object that is the when an object is placed at a height it stores some energy it is called "Potential Energy".

Formula used to calculate the "Potential Energy" is m\times g \times h

Where, "m" is mass of vase is given that 2 kg, "g" is acceleration due to gravity is 10 m/s^2 and "h" is height of the object where it placed is 1 m.

Substitute the given values in the formula,

Potential energy of the vase = 2\times10\times1

Potential energy of the vase = 20 J

7 0
3 years ago
Which of the following is a inert gas?<br>oxygen<br>chlorine<br>nitrogen<br>aragon​
Sophie [7]

Answer:

argon is an inert gas

Explanation:

an inert gas is when a chemical helium, xenon, neon, krypton, radon are also inert gases

5 0
3 years ago
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