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Magnesium silicide (76.70 g/mol) of mass 15.34 g reacts with excess hydrochloric acid and forms…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Magnesium silicide () of mass reacts with excess hydrochloric acid and forms only silane: . The silane is then burned in oxygen: . Take at and , and for silica. Find the volume of silane, the volume of oxygen that burns it and the mass of silica.
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The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Moles. of MgSi.
Step 2. Silane. The same number of moles: .
Step 3. Oxygen. .
Step 4. Silica. One mole of SiO for each mole of silane: .
Answer: , and .
Watch out. In practice the reaction gives a mixture of silanes, and only about a quarter of the silicon ends as . This problem takes the ideal case.
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