Hydrogen gas leaked out of a cylinder and only one gram of it was left. How many molecules are there in this one gram of hydrogen gas that is in constant random motion?
A
3.011×1023
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B
6.022×1023
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C
9.033×1023
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D
8.022×1023
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Solution
The correct option is A3.011×1023 Given mass of hydrogen = 1 g Gram molecular mass of H2 = 2 g
Number of moles of H2 = GivenmassingramsGrammolecularmass= 12 = 0.5 moles
Number of molecules in 1 mol of substance = 6.022×1023 So number of molecules in 0.50 mol of H2 = 6.022×1023×0.5 = 3.011×1023