Question

A pure sample of ethylamine was quantitatively analyzed for nitrogen
0.0275g of the pure sample was found to contain 0.007g nitrogen. What is mass % nitrogen in ethylamine

Answer 1

Given:

The quantity of ethylamine 0.0275g.

The quantity of nitrogen in sample 0.007g

To find:

Mass % of nitrogen in sample.

Solution:

1) To find the mass percentage we have the formula:

(Required number/Total number)×100

2) By applying the formula we have:

(mass of nitrogen/Total mass of sample)×100

• (0.007/0.0275)×100

• (70/275)×100

• 70×4/11

• 280/11

• 25.45%

Mass % of nitrogen in ethylamine is 25.45%