Ex. When 2.0g of oxygen reacts with nitrogen monoxide, how many moles of nitrogen dioxide are produced?
O2+2NO >>> 2NO
2.0gx (1 mol of O2/32.0g) x (2mol NO2/1mol O2) = 0.125 mol of NO2
Ex. If 3.0g of O2 with nitrogen monoxide, what volume of nitrogen dioxide is produced at STP?
1. O2 + 2NO2 >>> 2NO2
2. 3.0g x (1mol O2/ 32.0g) x (2mol NO2/1mol O2) x (22.4L/mol) = 4.2L
Ex. In the formation of Copper(II) Oxide, 4.0g of copper react. How many moles of copper oxide are produced?
1.2Cu + O2 >>> 2CuO
2. 4.0g x (2 Cu/63.5g) x (2mol of CuO/ 2mol Cu) = 0.126 mol CuO
Ex. What mass of water is produced when 5.5L of hydrogen is burnt(reacted w/O2)?
1. 2H2 + O2 >>> 2H2O
2. 5.5L x ( mol/22.4) x (18.0g/mol) = 4.4 g
Ex. Lead (IV) Nitrate reacts with 2.0g of potassium iodide. How many moles of leader (IV) nitrate are needed?
1. Pb (NO3)4 + 4KI >>> PbI4+ 4KNO3
2. 2.0g x (1mol PbI4/ 714.8g) x (1 mol Pb(NO3)4/ 1mol PbI4) = 2.8x 10-3 mol
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