The number of moles and volume in $56 \ g$ of nitrogen $(N_2)$ are respectively:

What is the number of molecules in $2.125 \text{ g}$ of ammonia $(NH_3)$?

How many protons are present in $1.8 \ g$ of $NH_{4}^{+}$?

If the price of $1 \ kg$ of common salt is $7$ rupees and the price of $1 \ kg$ of sugar is $14$ rupees,then what is the cost of $1 \ mole$ of salt and sugar?

The total number of protons in $10 \ g$ of calcium carbonate is $(N_0 = 6.023 \times 10^{23})$

Assertion $(A)$: Equal moles of different substances contain the same number of constituent particles.
Reason $(R)$: Equal weights of different substances contain the same number of constituent particles.
The correct answer is