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Standard IX

Chemistry

Atomic Mass and Atomic Mass Unit

Question 7Whi...

Question

Question 7
Which of the following contains maximum number of molecules?

(a) $1 g C O_{2}$
(b) $1 g N_{2}$
(c) $1 g H_{2}$
(d) $1 g C H_{4}$

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Solution

We know, 16 g of $C H_{4}$ , 44g of $C O_{2}$ and 28g of $N_{2}$ consist of Avogardro number of particles.
But 2g of $H_{2}$ consist of Avogadro number of particles.
$∴ 1 g o f H_{2} = \frac{1}{2} N_{A} = 0.5 N_{A} = 0.5 \times 6.022 \times 10^{23} = 3.011 \times 10^{23}$

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Atomic Mass and Atomic Mass Unit

Standard IX Chemistry

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Question 7 Which of the following contains maximum number of molecules? (a) 1g CO2 (b) 1g N2 (c) 1g H2 (d) 1g CH4

We know, 16 g of CH4, 44g of CO2 and 28g of N2 consist of Avogardro number of particles. But 2g of H2 consist of Avogadro number of particles. ∴1 g of H2=12NA=0.5NA=0.5×6.022×1023=3.011×1023

Question 7
Which of the following contains maximum number of molecules?

(a) $1 g C O_{2}$
(b) $1 g N_{2}$
(c) $1 g H_{2}$
(d) $1 g C H_{4}$

We know, 16 g of $C H_{4}$ , 44g of $C O_{2}$ and 28g of $N_{2}$ consist of Avogardro number of particles.
But 2g of $H_{2}$ consist of Avogadro number of particles.
$∴ 1 g o f H_{2} = \frac{1}{2} N_{A} = 0.5 N_{A} = 0.5 \times 6.022 \times 10^{23} = 3.011 \times 10^{23}$