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Sagot :
Answer:
0.63grams
Explanations
The balanced reaction between Zinc and hydrochloric acid is given as:
[tex]Zn+2HCl\rightarrow H_2+ZnCl_2[/tex]Given the following parameters
Mass of Zinc = 20.5 grams
Determine the moles of zinc
[tex]\begin{gathered} mole\text{ of Zn}=\frac{mass}{molar\text{ mass}} \\ mole\text{ of Zn}=\frac{20.5}{65.38} \\ mole\text{ of Zn}=0.314moles \end{gathered}[/tex]According to stoichiometry 1 mole of Zinc produces 1 mole of hydrogen gas.The moles of hydrogen that was produced will be 0.314moles
Determine the mass of hydrogen gas
[tex]\begin{gathered} Mass\text{ of H}_2=mole\times molar\text{ mass} \\ Mass\text{ of H}_2=0.314\times2.016 \\ Mass\text{ of H}_2\approx0.63grams \end{gathered}[/tex]Hence the mass of hydrogen gas that will be produced is 0.63grams
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