calculate the volume of ammonia gas produced at STP when140g of N2 gas react with 30g of h2 gas
Answers
Answered by
0
this is ur ans
Nonetheless, that doesn't help you do your stoichiometry problem except to let you know that your teacher sometimes fudges the chemistry. So assuming that we make the reaction go to completion....
N2(g) + 3H2(g) --> 2NH3(g)
140g.....30g ..........?g
This is a limiting reactant problem. Compute the mass of NH3 produced using the mass of each reactant. The actual amount of NH3 will be lesser of the two.
140g N2 x (1 mol N2 / 28.0g N2) x (2 mol NH3 / 1 mol N2) x (17.0g NH3 / 1 mol NH3) = 170 g NH3
30 g H2 x (1 mol H2 / 2.02g H2) x (2 mol NH3 / 3 mol H2) x (17.0g NH3 / 1 mol NH3) = 168g NH3
Therefore, you would produce 168g of ammonia, the lesser of the two. The catch is that since you restricted the precision of the answer by using only two significant digits, the answer must be expressed as 170 g NH3, to two significant digits. Actually, if we only use 2.0 g/mol for the molar mass of H2, then the second answer becomes 170g NH3 as well. The 140g and 30 grams are essentially stoichiometric.
Nonetheless, that doesn't help you do your stoichiometry problem except to let you know that your teacher sometimes fudges the chemistry. So assuming that we make the reaction go to completion....
N2(g) + 3H2(g) --> 2NH3(g)
140g.....30g ..........?g
This is a limiting reactant problem. Compute the mass of NH3 produced using the mass of each reactant. The actual amount of NH3 will be lesser of the two.
140g N2 x (1 mol N2 / 28.0g N2) x (2 mol NH3 / 1 mol N2) x (17.0g NH3 / 1 mol NH3) = 170 g NH3
30 g H2 x (1 mol H2 / 2.02g H2) x (2 mol NH3 / 3 mol H2) x (17.0g NH3 / 1 mol NH3) = 168g NH3
Therefore, you would produce 168g of ammonia, the lesser of the two. The catch is that since you restricted the precision of the answer by using only two significant digits, the answer must be expressed as 170 g NH3, to two significant digits. Actually, if we only use 2.0 g/mol for the molar mass of H2, then the second answer becomes 170g NH3 as well. The 140g and 30 grams are essentially stoichiometric.
Similar questions