Question

What is the percent composition (by mass) of nitrogen in KNO3?

Flag question: Question 5
Question 58 pts
What is the percent composition (by mass) of nitrogen in (NH4)3PO4?

Flag question: Question 6
Question 68 pts
What is the percent composition (by mass) of hydrogen in (NH4)2S?

Flag question: Question 7
Question 78 pts
What is the percent composition (by mass) of nitrogen in N2S2?

Flag question: Question 8
Question 88 pts
What is the percent composition (by mass) of potassium in KNO3?

Flag question: Question 9
Question 98 pts
Calculate the percentage of carbon (by mass) in C3H5.

Answer 1

Atomic masses used: H = 1.008, C = 12.01, N = 14.01, O = 16.00, K = 39.10, P = 30.97, S = 32.06.

1) KNO3
M = 39.10 + 14.01 + 3(16.00) = 101.11 g/mol
%N = 14.01/101.11 × 100 = 13.9%

2) (NH4)3PO4
M = 3(14.01) + 12(1.008) + 30.97 + 4(16.00) = 149.10 g/mol
%N = 42.03/149.10 × 100 = 28.2%

3) (NH4)2S
M = 2(14.01) + 8(1.008) + 32.06 = 68.14 g/mol
%H = 8.064/68.14 × 100 = 11.8%

4) N2S2
M = 2(14.01) + 2(32.06) = 92.14 g/mol
%N = 28.02/92.14 × 100 = 30.4%

5) KNO3 (potassium)
%K = 39.10/101.11 × 100 = 38.7%

6) C3H5
M = 3(12.01) + 5(1.008) = 41.07 g/mol
%C = 36.03/41.07 × 100 = 87.8%