Chemistry C3 triple science question

1 mol of magnesium, Mg, reacts to give 1 mol of hydrogen, H2.
The experiment shows that 0.072 g of magnesium reacts to produce 66 cm3

of hydrogen.
Calculate the volume of 1 mol of hydrogen, H2
(relative atomic mass: Mg = 24)

Reply 1

Ché.

ImageUploadedByStudent Room1397837513.588516.jpg

I hope this is right...
I'm not sure the mark allocation but I'm guessing it's 2/3?
I'm going for 0.072 as well or 22x10^cm^3 dependent on the comparison you'll use... :biggrin:

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Reply 2

Angelo12231

Original post by Ché.

I hope this is right...
I'm not sure the mark allocation but I'm guessing it's 2/3?
I'm going for 0.072 as well or 22x10^cm^3 dependent on the comparison you'll use... :biggrin:

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yh i got that at the end... have you got like a formula for this that applies to any questions similar to this one? thanks

Reply 3

Ché.

Original post by Angelo12231

yh i got that at the end... have you got like a formula for this that applies to any questions similar to this one? thanks

I sure do...
(I study A2 Chemistry, so I would have this...)

N = m/M
Where:
N = Moles
m = amount in grams
M = molecular mass of compound!

N = cV
Where:
N = Moles
c = Concentration
V = Volume.
:biggrin:

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Reply 4

Angelo12231

Original post by Ché.

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i want to do A level chem too... can't believe triple science books havent got these formulas :angry:

Reply 5

Ché.

Original post by Angelo12231

i want to do A level chem too... can't believe triple science books havent got these formulas :angry:

I would have thought the new specifications would infuse these in yay some point!

I just don't know - I used those confidently for this type of question so you'll be fine with these. :smile:

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Reply 6

Angelo12231

Original post by Ché.

I would have thought the new specifications would infuse these in yay some point!

I just don't know - I used those confidently for this type of question so you'll be fine with these. :smile:

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thank you