Calculate the number of moles present in $9.10 \times 10^{-2} \ kg$ of water.

$A$ quantity of aluminium has a mass of $54.0 \ g$. What is the mass of the same number of magnesium atoms? ........... $g$

Assertion : Equal moles of different substances contain same number of constituent particles.
Reason : Equal weights of different substances contain the same number of constituent particles.

Which of the following substances consists of a total of $1 \ mol$ of atoms? (Molar mass of $NH_3 = 17 \ g/mol, H_2O = 18 \ g/mol, N_2 = 28 \ g/mol, CO_2 = 44 \ g/mol$)

What is the mass of $1$ mole of electrons?

The number of moles of $SO_2Cl_2$ in $13.5 \ g$ is