Q11 of 24 Page 97

Convert 12.044 × 1023 number of He atoms into number of moles.

We know, 1 mole = 6.022 × 1023(Na = Avogadro’s number)



Number of moles = 2


Thus, number of moles of He is 2.


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[Atomic mass of Cu = 63.5 u, S = 32 u, O = 16 u, H = 1 u]


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Calculate the mass of 0.5 mole of N2 gas.

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 13

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