Question

Calculate the mass percent composition for each of the following compounds 1) 3.80 g of Ca and 3.70 g of F 2)0.390 g of Na and 0.245 g of O 3)12.6 g of K, 17.8 g of Mn, and 20.8 g of O

Answer 1

Q1. mass Ca = 3.80 g

mass F = 3.70 g

Total mass = (mass Ca) + (mass F)

Total mass = (3.80 g) + (3.70 g)

Total mass = 7.50 g

mass percent Ca = (mass Ca / Total mass) * 100

mass percent Ca = (3.80 g / 7.50 g) * 100

mass percent Ca = (0.507) * 100

mass percent Ca = 50.7 %

mass percent F = 100% - (mass percent Ca)

mass percent F = 100% - 50.7%

mass percent F = 49.3 %

Q2.

mass Na = 0.390 g

mass O = 0.245 g

Total mass = (mass Na) + (mass O)

Total mass = (0.390 g) + (0.245 g)

Total mass = 0.635 g

mass percent Na = (mass Na / Total mass) * 100

mass percent Na = (0.390 g / 0.635 g) * 100

mass percent Na = (0.614) * 100

mass percent Na = 61.4 %

mass percent O = 100% - (mass percent Na)

mass percent O = 100% - 61.4%

mass percent O = 38.6 %

Q3.

mass K = 12.6 g

mass Mn = 17.8 g

mass O = 20.8 g

Total mass = (mass K) + (mass Mn) + (mass O)

Total mass = (12.6 g) + (17.8 g) + (20.8 g)

Total mass = 51.2 g

mass percent K = (mass K / Total mass) * 100

mass percent K = (12.6 g / 51.2 g) * 100

mass percent K = (0.246) * 100

mass percent K = 24.6 %

mass percent Mn = (mass Mn / Total mass) * 100

mass percent Mn = (117.8 g / 51.2 g) * 100

mass percent Mn = (0.348) * 100

mass percent Mn = 34.8 %

mass percent O = (mass O / Total mass) * 100

mass percent O = (20.8 g / 51.2 g) * 100

mass percent O = (0.406) * 100

mass percent O = 40.6 %