Question

The mass of one gallon of water is approximately 3.78 kg or 3780 grams. How many moles are contained in one gallon of water?

a. 102
b. 210
c. 120
d. 201

Answer 1

Number of moles of water = 210 mol

Step-by-step explanation:

Given data:

Mass of water = 3780 g

Number of moles of water = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of water = 18 g/mol

Number of moles = 3780 g/ 18 g/mol

Number of moles of water = 210 mol