Question

When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide

(MgO) was produced. How much oxygen must be added?

Answer 1

1. What is the coefficient for calcium in the balanced equation?

2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2

2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must

write the equation, balance it and solve the mass-mass problem.

a. Balanced equation:

2 C2H2 + 5 O2  4 CO2 + 2 H2O

Step-by-step explanation: