1. A student correotly predicted that 8.00g of a precipitate would form when two aqueous solutions were reacted. When the solid was filtered and weighed, 10.00g of solid had been collected. A cause for the discrepancy is that a. The sample was dry when weighed b. The student forgot to subtract the mass of the filter paper c. Some precipitate went through the filter paper or funnel d. The student did the reaction at STP and not SATP 2. How many moles of oxygen are needed to burn 2.00mol of butane (C4H10(3)) in a butane lighter? a. 2.15mol b. 6.52mol c. 13.0mol d. 19.5mol 3. When heated, calcium carbonate releases carbon dioxide gas and leaves behind a residue of solid calcium oxide. The number of moles of carbon dioxide released when 46.3g of calcium carbonate is heated is a. 0.463mol b. 1.00mol c. 2.16mol d. 20.4mol