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in Some basic concepts in chemistry by (25 points)
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The maximum number of molecules is present in 

(a) 15 L of H2 gas at STP

(b) 5 L of N2 gas at STP 

(c) 1.5 g of H2 gas 

(d) 5 of O2 gas

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1 Answer

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Correct option is (c) 1.5 g H2 gas

As we know

1 mole of gas at STP occupies = 22.4 L Volume

and 1 mole of molecules contains = 6.022 x 1023 molecules.

(a) 15 L H2 gas at STP = \(\frac{15}{22.4}\) mol H2\(\frac{15}{22.4} \times 6.022\times10^{23}\) Hmolecules

(b) 5 L N2 gas at STP = \(\frac{5}{22.4}\) mol H2 = \(\frac{5}{22.4} \times 6.022\times10^{23}\) Nmolecules

(c) 1.5 g H2 gas = \(\frac{1.5}2\) mol H2 = \(\frac{1.5}2 \times 6.022\times10^{23}\) Hmolecules

(d) 5 g of O2 gas = \(\frac5{32}\) mol H2 = \(\frac5{32}\times 6.022\times10^{23}\) Omolecules

Hence, 1.5g of H2 gas has maximum number of H2 molecules.

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