Question 1:

What is Avogadro's number?

Explanation: Avogadro's number is represented by 6.022 × 10^23, option A.

Question 2:

Which of the following represents the mole concept?

Explanation: The mole concept refers to option A, which is the amount of a substance that contains 6.022 × 10^23 particles.

Question 3:

What is the molar mass of water (H2O)?

Explanation: The molar mass of water (H2O) is 18 g/mol, option A.

Question 4:

How many moles are there in 24 grams of carbon dioxide (CO2)?

Explanation: To calculate the number of moles, divide the given mass (24 g) by the molar mass of carbon dioxide (44 g/mol). The result is 0.545 moles, which is approximately 0.5 moles, option B.

Question 5:

What is the volume occupied by 2 moles of nitrogen gas (N2) at standard temperature and pressure (STP)?

Explanation: At STP, 1 mole of any gas occupies a volume of 22.4 liters. Therefore, 2 moles of nitrogen gas (N2) will occupy 2 times that volume, which is 44.8 L, option B.