Calculate the mass of scheelite (CaWO4) that contains a million (1.0 × 10°) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.

Calculate the mass of hydrazine (NH4) that contains a trillion (1.00 × 1012) hydrogen atoms. Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits. ☐ ☐ x10

Calculate the volume in liters of a 129. g/dL silver perchlorate solution that contains 255. g of silver perchlorate (AgClO,). Be sure your answer has the correct number of significant digits. x10 ?

A major component of gasoline is octane C8H18 . When liquid octane is burned in air it reacts with oxygen O2 gas to produce carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 0.085mol of water. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.

Ammonium phosphate ((NH₂), PO4) is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid (H₂PO4) with liquid ammonia. Calculate the moles of phosphoric acid needed to produce 1.0 mol of ammonium phosphate. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits. 0 00 X

Gaseous ethane  CH3CH3  will react with gaseous oxygen  O2  to produce gaseous carbon dioxide  CO2  and gaseous water  H2O . Suppose 4.2 g of ethane is mixed with 6.90 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

Calculate the mass of glucose (C6H₁2O6) that contains a billion (1.0 × 10°) oxygen atoms. H. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. X S

Calculate the mass of glucose (CGH1206) that contains a billion (1.0 x 10°) oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. x10

Gaseous ethane CH3CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 0.90 g of ethane is mixed with 6.65 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.