Question

Ca + O2 ==> CaO

How many grams of oxygen gas are required to produce 100. g of calcium oxide? Remember to balance the equation and use significant figures in your final answer. HELP!

Answer 1

2Ca + O2 ==> 2CaO

you need 3 conversion factors first to cenvert mass of CaO to moles of CaO, second to convert moles of CaO to moles of O2, last to convert moles of O2 to grams of O2.

100 g CaO x (1 mol CaO / MM CaO) x (1 mol O2 / 2mol CaO) x (32g O2 /1mol O2) = ???? g O2