Question

The yellow molecules (Y3) react with the blue molecules (B2) to form molecules of Y2B, as shown in the image. Each circle represents one mole, and the atomic masses of Y and B are 32.0 and 54.0, respectively.

How many grams of Y3 are there?
How many grams of B2 are there?

Answer 1

1. The mass in grams of Y3 present is 1152 g

2. The mass in grams of B2 present is 864 g

Description of mole

The mole of a substance is related to it's mass and molar mass according to the following equation

Mole = mass / molar mass

With the above formula, we can obtain the mass of Y3 and B2. Details below:

1. How to determine the mass of Y3

• Mole of Y3 = 12 moles
• Molar mass of Y3 = 3 × 32 = 96 g/mol
• Mass of Y3 =?

The mass of Y3 can be obtained as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of Y3 = 12 × 96

Mass of Y3 = 1152 g

2. How to determine the mass of B2

• Mole of B2 = 8 moles
• Molar mass of B2 = 2 × 54 = 108 g/mol
• Mass of B2 =?

The mass of B2 can be obtained as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of B2 = 8 × 108

Mass of B2 = 864 g

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