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aalyn [17]
2 years ago
12

Select the correct answer.

Chemistry
1 answer:
Sati [7]2 years ago
4 0

Answer:

B.) 2.92

Explanation:

Tp find the mass of H₂ produced, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass), then (2) convert moles AlCl₃ to moles H₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂ to grams H₂ (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.

Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)

Molar Mass (AlCl₃): 133.341 g/mol

2 Al + 6 HCl ---> 2 AlCl₃ + 3 H₂

Molar Mass (H₂): 2(1.008 g/mol)

Molar Mass (H₂): 2.016 g/mol

129 g AlCl₃           1 mole              3 moles H₂             2.016 g
------------------  x  ------------------  x  ---------------------  x  ---------------  =
                            133.341 g          2 moles AlCl₃          1 mole

=  2.93 g H₂

*our answers are most likely different due to using slightly different molar masses

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