Some Basic Concepts

What is the SI unit of amount of substance?

Avogadro's number is approximately equal to:

If 12 grams of carbon contains 6.022 × 10²³ atoms, the number of atoms in 24 grams of carbon will be:

The molar mass of a compound is:

Which of the following represents the correct relation between molecular mass (M) and molar mass (M_m)?

One mole of an ideal gas occupies 22.4 liters at:

The empirical formula of a compound is CH₂O. If its molecular mass is 180 g/mol, what is its molecular formula? (Atomic masses: C=12, H=1, O=16)

Calculate the number of moles in 44 grams of CO₂. (Atomic masses: C=12, O=16)

Which of the following is NOT a fundamental concept in chemistry?

If 1 mole of a substance contains 6.022 × 10²³ particles, how many particles are there in 0.25 mole?