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

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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)

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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!

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What is the potential energy of a 2-kg vase sitting on a table with a height of 1 meter?

lisov135 [29]

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

Explanation:

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.