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The molar mass of HCl is 36.5g use the fact that 1 amu = 1.6605x 10-24g power g to calculate Avogradro’s number.

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hydrogen nucleus =
1 gram/mol = 1 amu * AV molecules/mol * 1.6605*10^-24 grams/amu
so
AV = 1 /(1.6605*10^-24
= .6022 * 10^24
= 6.022*10^23

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