List – I List – II (Mass of substance) (Number of atoms)

Question

Match List – I with List – II.

Choose the correct answer from the options given below: [2026]

Smart Achievers · Accepted Answer

(3)

Mass of substance	Moles of substance (given mass/molar mass)	Number of molecules	Atoms = Atomicity × number of molecules
1.8 mg water $(H_{2} O)$	$\frac{1.8 \times 10^{- 3}}{18} = 10^{- 4}$	$10^{- 4} N_{A}$	$3 \times 10^{- 4} N_{A}$
9.8 mg sulphuric acid $(H_{2} {SO}_{4})$	$\frac{9.8 \times 10^{- 3}}{98} = 10^{- 4}$	$10^{- 4} N_{A}$	$7 \times 10^{- 4} N_{A}$
1.8 mg carbon (C)	$\frac{1.8 \times 10^{- 3}}{12} = 1.5 \times 10^{- 4}$	$1.5 \times 10^{- 4} N_{A}$	$1.5 \times 10^{- 4} N_{A}$
5.85 mg NaCl	$\frac{5.85 \times 10^{- 3}}{58.5} = 10^{- 4}$	$10^{- 4} N_{A}$	$2 \times 10^{- 4} N_{A}$

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