Processing math: 100%

Home / Aptitude Tests / Chemistry / The number of oxygen...

The number of oxygen molecules present in 16.0g of the gas i...

The number of oxygen molecules present in 16.0g of the gas is ______?
[Avogadro's number = 6.02 x 10²³]

A.

6.02 x 10²²

B.

6.02 x 10²³

C.

3.01 x 10²³

D.

1.51 x 10²³

View answer & explanation

Correct answer is C

1 mole = Molar mass of gas = Avogadros number
32g of O₂ = 6.02 x 10²³
16g of O₂ = x
x = $\frac{16 \times 6.02 \times 10^23}{32}$ = 3.01 x 10²³

See all Chemistry questions & answers

See more WAEC questions & answers

Similar Questions

The pH of 0.50 mol dm-3 solutions of HCI, H2SO4 and CH3COOH were measured. which of the following st...

An aqueous solution of (NH4)2 SO4 is ...

There is a large temperature interval between the melting point and the boiling point of a metal bec...

The atomic weight of nitrogen is? ...

When chlorine water is exposed to bright sunlight, the following products are formed ...

The ratio of carbon atoms of hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, wh...

What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0g? ...

An atom 17 protons, 17 electrons and 18 neutrons has a mass number of ...

What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na=23, O=16, ...

The densities of two gases, X and Y are 0.5gdm-3 and 2.0gdm-3 respectively. What is the rate of diff...

Aptitude Tests

Spatial Reasoning Questions and Answers

Typing Speed and Accuracy Test

Nigeria General Knowledge Questions and Answers

Data Interpretation Questions and Answers

Microsoft Office Questions and Answers

Puzzles Questions and Answers

Abstract Reasoning Questions and Answers

Verbal Reasoning Questions and Answers

Numerical Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Logical Reasoning Questions and Answers

Situational Judgement Questions and Answers

Personality Test

View latest jobs in Nigeria today