Hey everyone, I have a homework question that I would appreciate some clarification on. Question: A 3.96g sample of magnesium carbonate decomposed to produce 1.89g of magnesium oxide. What mass of magnesium was in the sample of magnesium carbonate? Calculate the mass percent of of magnesium, by mass, in the magnesium oxide produced. How much CO2 (carbon dioxide) was released into the atmosphere? Solution: In an example in the textbook it states that there is 0.301g of magnesium in 0.500g of magnesium oxide. Using this information, since MgCO3 --------(arrow) MgO + CO2 1.89g magnesium oxide X 0.301g magnesium/0.500 magnesium oxide = 1.14g of magnesium in 1.89g magnesium oxide therefore, there is 1.14g of magnesium in 3.96g of magnesium carbonate. and, 3.96g magnesium carbonate - 1.89g magnesium oxide = 2.07g Carbon dioxide released into atmosphere. Can anyone please verify if my solution is correct, please?