What are the formula masses of water, O; propene, ; and 2-propanol, O?

Question

What are the formula masses of water,  O; propene,   ; and 2-propanol,   O?

Quizplus · Accepted Answer

- Water: One molecule of water consists of 2 hydrogen atoms and 1 oxygen atom. The atomic mass of hydrogen is 1 amu and the atomic mass of oxygen is 16 amu. Therefore, the formula mass of water is calculated as:

2(1 amu) + 1(16 amu) = 18 amu

- Propene: One molecule of propene consists of 3 carbon atoms and 6 hydrogen atoms. The atomic mass of carbon is 12 amu and the atomic mass of hydrogen is 1 amu. Therefore, the formula mass of propene is calculated as:

3(12 amu) + 6(1 amu) = 42 amu

- 2-Propanol: One molecule of 2-propanol consists of 3 carbon atoms, 8 hydrogen atoms, and 1 oxygen atom. The atomic mass of carbon is 12 amu, the atomic mass of hydrogen is 1 amu, and the atomic mass of oxygen is 16 amu. Therefore, the formula mass of 2-propanol is calculated as:

3(12 amu) + 8(1 amu) + 1(16 amu) = 60 amu

Hence, the correct option is (C) water: 18 amu; propene: 42 amu; 2-propanol: 60 amu.

What Are the Formula Masses of Water, O; Propene