Question

Magnesium burns in air to produce magnesium oxide MgO and magnesium nitride Mg3N2. Magnesium nitride reacts with water to give ammonia.

What volume of ammonia gas at 24 degrees C and 753 mmHg will be produced from 4.56 g of magnesium nitride.

P= 753 mmHg (1 atm/ 760mmHg)= .991 atm
V=?
n= 4.56 Mg3N2 ( 1 mol Mg3N2/100g)(2 mol NH3/ 1 mol Mg3N2)= .0912 mol NH3
R= .0821
T= 24 + 273= 297 K

.991 atm (V)= .0912(0.0821)(297)=

ANSWER:
V= 2.24 NH3

Is this correct
I obtained an answer of 2.22 L NH3. I think the difference is that I used 100.9 for the molar mass of Mg3N2. Also you didn't give a unit for your value.

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