A mixture of aluminum and copper weighing 20 g was acted upon with an alkali solution when heated
| March 18, 2021 | education
A mixture of aluminum and copper weighing 20 g was acted upon with an alkali solution when heated, while a gas with a volume of 6.72 liters was released. Determine the mass fraction of aluminum in the mixture.
The solution of the problem:
2Al + 2NaOH + 2H2O = 2NaAlO2 + H2Ca + NaOH = no reaction.
x = 54g * 67.2l / 6.72l W (Al) = 5.4g / 20g * 100% = 27%
Answer: 27%
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