5
QuizMultiple Choice
Stoichiometric Calculations
Question 5 of 10 • PA-Physical Science A
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO).2Mg + O2 2MgONiven wants to calculate the mass of MgO that is produced by the burning of 28.0 g of Mg. What is the first step in Niven’s calculation?
Answer
A
Balance the chemical equation.B
Convert grams of Mg to moles.C
Determine whether heat is given off by this reaction.D
Find the number of Mg atoms in the sample.