Question

a sample of ammonia contains 9g hydrogen and 42g nitrogen. another sample contains 5g hydrogen .calculate the amount of nitrogen in the second sample

Answer 1

9 g of hydrogen - 42 g of nitrogen
5 g of hydrogen - x g of nitrogen

$9x=42 \cdot 5 \\ 9x=210 \\ x \approx 23.33$

The mass of nitrogen in the second sample is 23.33 g.