Question

A 8.12 g sample of HCN contains 0.301 g of H and 4.21 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.53 g

Answer 1

Solution :-

8.12 g HCN contains 0.301 g H and 4.21 g N

Therefore using this information we can find the mass of the H and N in the 3.53 g HCN

Calculating the mass of the H

3.53 g HCN * 0.301 g H / 8.12 g HCN = 0.131 g H

Calculating mass of N

3.53 g HCN * 4.21 g N / 8.12 g HCN = 1.83 g

Now lets calculate the mass of C in 3.53 g HCN sample

Mass of C = mass of HCN – ( mass of H + mass of N)

                   = 3.53 g – (0.131 g H + 1.83 g N)

                   = 1.57 g C

So the mass of the C in the 3.53 g HCN is 1.57 g C