Question

You are given 120g of calcium. How many moles of calcium have you been given?

A) 2 moles
B) 3 moles
C) 4 moles
D) 5 moles

Answer 1

The number of moles of calcium for a given mass of 120g is calculated using its atomic mass, which is approximately 40 g/mol, resulting in 3 moles of calcium.

Step-by-step explanation:

To calculate the number of moles of calcium given a mass of 120g, you need to know the atomic mass of calcium. The atomic mass of calcium (Ca) is approximately 40 grams per mole. Using the formula:

Moles = Mass (g) / Molar mass (g/mol)

We get:

Moles = 120g / 40 g/mol = 3 moles

Therefore, you have been given 3 moles of calcium, which corresponds to answer B).