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TLUON
You should get about 78.4 g H. Convert grams of HCl to moles of HCl by finding total atomic mass of HCl. From there, convert mole of HCl to moles of H which is 1. Last, convert moles of H to g H which is 1g and you should get your answer. Don't forget significant figures. Since you are given 3 in your given information, your answer should have 3 significant figures.

Answer: [tex]12.95\times 10^{23}[/tex]

Explanation:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

[tex]{\text {Moles of HCl}=\frac{78.4g}{36.5g/mol}=2.15[/tex]

According to Avogadro's law, 1 mole of every substance contains Avogadro's number of particles.

1 mole of HCl contains=[tex]6.023\times 10^{23}[/tex] atoms of Hydrogen

2.15 moles of HCl contains=[tex]\frac{6.023\times 10^{23}}{1}\times 2.15=12.95\times 10^{23}[/tex] atoms of hydrogen.



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