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13.02.2021 •
Chemistry
Students in chemistry class have been given the assignment to use flame test emission data to determine the identity of an
unknown substance. When the students put a sample of the unknown compound in the flame, blue and green colors were visible.
What could be one explanation for these results?
A)
The Bunsen burner must not be working properly.
B)
The unknown substance must be a sodium compound.
The unknown substance contained both copper and lead.
D)
It is impossible to narrow down anything about the unknown
Solved
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Ответ:
1.10 g H₂
Explanation:
The reaction is
2HCl + Mg → MgCl₂ + H₂
An excess of magnesium metal means that the limiting reactant is HCl, so we use the mass of HCl given by the problem to calculate how many grams of H₂ are produced.
In order to make this calculation we need to keep in mind the molar mass of HCl, of H₂, and the reaction stoichiometry:
40.0 g HCl *
1.10 g H₂