Question

Gunpowder contains 75% nitrite 15% charcoal and rest sulphur find the amount of sulphur in 9 kg of gunpowder

Answer 1

100%-(75%+15%)=10%. So gunpowder contains 10% sulphur. To calculate the amount of sulphur in 9 kg of gunpowder we must multiply: 9∙0.1=0.9 kg.