Question

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 336.0 mg of saltpeter?

Answer 1

Answer:

The answer to your question is 0.1595 mg of Oxygen

Explanation:

Data

K = 38.67 g

N = 13.86 g

O = ?

Mass of oxygen in 336 mg

Process

1.- Convert 336 mg to grams

                           1000 mg ----------------- 1 g

                            336 mg  ----------------  x

                            x = (336 x 1)/1000

                            x = 0.336 g of sample

2.- Calculate the mass of oxygen in 100g

Mass  of oxygen = 100g - 38.67g - 13.86g

                            = 47.47 g

This means that oxygen represents 47.47% of the sample

3.- Calculate the grams of Oxygen in 0.336 mg.

Mass of Oxygen = (0.336)(0.4747)

Mass of Oxygen = 0.1595 mg