Q02-19-03-D7-Percent-Density Working Mode: Pairs Reading: Z Chap 2.6 p30-35 Learning Objective: To develop a better understanding of percent and density and how to interpret them as conversion ratios. Using Percent and Density as a Conversion Factor Ratio A mixture of liquid carbon disulfide (CS₂) and liquid benzene (CeHe) that had a mass of 64.0g was found to be 45.0 % carbon disulfide by mass. The density of carbon disulfide is 1.263 g/mL and the density of benzene is 0.879 g/mL. Calculate the volumes of carbon disulfide and benzene that were added together to form the mixture. Step 1: Represent % carbon disulfide as the ratio mass (g) of carbon disulfide /100 g mixture. Step 2: Use the ratio from 1 as a conversion factor to determine the mass of carbon disulfide in the mixture. Step 3: Represent the density of carbon disulfide as the ratio of the mass (g) of carbon disulfide /1mL carbon disulfide. Step 4: Use the density ratio from 3 as a conversion factor to determine the volume of carbon disulfide. 1 64.0 (5₂8646 1 Step 5: Use the mass of carbon disulfide in the mixture to find the mass of benzene. Step 6: Represent the density of benzene as the ratio of the mass (g) of benzene /1mL benzene. Step 7: Use the density ratio from 6 as a conversion factor to determine the volume of benzene. 64.09 CS₂ C6H6 0 0:45(5₁ : 45:100 = Tvo: Chapt 28:8д х 28-1 28.89 (5₂2x X 64.09 1-263g/ml 1 0.019g/ml = 30.9408ml Cotto volume 1.56 1-56 0.45 TOTAL BENEZENE: 35.gg (₂16 35.2g CcMo 1 45.0g/Sa 100.09 = 36-3744ml (S₂ volume. B. The compound magnesium oxide contains only magnesium and oxygen and is prepared by burning magnesium. Magnesium oxide is 39.7 % by mass magnesium. A sample of magnesium oxide has a mass of 340 g. What mass (g) of magnesium was burned to produce the magnesium oxide sample. Assume all the magnesium that burned is present in the magnesium oxide sample If the density of magnesium is 1.74 g/mL, what volume (mL) of magnesium was burned? Step 1: Represent % magnesium in magnesium oxide as the ratio mass (g) of magnesium /100 g magnesium oxide. Step 2: Use the ratio from 1 as a conversion factor to determine the mass of magnesium in the magnesium oxide sample. Step 3: Represent the density of magnesium as the ratio of the mass (g) of magnesium /1mL magnesium. Step 4: Use the density ratio from 3 as a conversion factor to determine the volume of magnesium from the mass of magnesium.

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