Saltpeter is a compound made of potassium (k), nitrogen (n), and oxygen (o). Every 100.00 g of saltpeter contains 38.67 g potassium and 13.86 g nitrogen. What is the mass of oxygen contained in 334.0 mg of saltpeter

Given dа ta:

Compound saltpeter contains the elements: Potassium (K), Nitrogen (N) and Oxygen (O)

Total Mass of saltpeter = 100 g

Mass of K = 38.67 g

Mass of N = 13.86 g

Mass of O = Total mass - (mass of K + mass of N)

= 100 - (38.67 + 13.86) = 47.47 g

Thus, a 100 g sample of saltpeter contains 47.47 g of oxygen

Therefore, a sample of mass 334.0 mg i. e. 0.3340 g would contain:

0.3340 * 47.47/100 = 0.1585 g i. e. 158.5 mg of oxygen