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Check please answers of the exercises.

Ex.1.40 g of zinc oxide was reduced by excess carbon. Determine the mass of the formed metal if the yield of the reaction product is 85%.

Ex.2.490 g of a 20% solution of sulfuric acid was neutralized with slaked lime Ca (OH) 2, and 60.6 g of calcium sulfate was obtained. Determine the yield of the product in% to the theoretical

Ex.3.Acetylene is produced by the interaction of calcium carbide with water. How many grams of acetylene will be obtained if 68 g of calcium carbide contains 7% of impurities and the yield of acetylene is 75% of the theoretical value.

№1.1)ν(ZnO)=0.494 mol

2)ν(Zn)=ν(ZnO)0.494 mol

3)m[theor.](Zn)=32 g

4)m[pr.](Zn)=27.2g

Answer:27.2.

№2.1)m(H2SO4)=98g

2)ν(H2SO4)=1 mol

3)m[theor.](CaSO4)=136g

4)η(CaSO4)=45%

Answer:45%.

№3.1)m(imp.)=4.76 g

2)m(CaC2)=63.24 g

3)m[theor.](C2H2)=26 g

4)m[pr.](C2H2)=19.5 g

Answer: 19.5.