How many moles of carbon atoms are present in $3.6 \ kg$ of carbon?

What is the number of molecules in $4.25 \ g$ of $NH_3$?

How many molecules are present in one gram of hydrogen? (Value $\times 10^{23}$)

The number of atoms present in $0.1 \ mol$ of a triatomic gas is: $(N_A = 6.022 \times 10^{23} \ mol^{-1})$

Which of the following contains the maximum number of molecules?

$A$ flask contains $98 \ mg$ of $H_2SO_4$. If $3.01 \times 10^{20}$ molecules of $H_2SO_4$ are removed from the flask,the number of moles of $H_2SO_4$ remaining in the flask is $\left(N_A = 6.02 \times 10^{23}\right)$