Question

What is the molar mass of CaCl2?
110 g/mol
75.5 g/mol
37 g/mol
54 g/mol

What is the molar mass of Ca(OH)2
100 g/mol
37 g/mol
74 g/mol
57 g/mol

What percent of is calcium in Ca(OH)2?
43.4%
2.7%
70.2%
54.1%

Convert 45.5 cm to m?
.455 m
4550 m
45500 m
.0455 m

Convert 30.5 mm to km?
3.05 X 10^5 km
3.05 X 10^-5 km
3050 km
.305 km 6

Answer 1

Molar mass of CaCl2 = 40+ ( 35.5 ×2)=110

Mr of Ca(OH)2 = 40+ (16+1)×2 =74

%of Ca = (40÷ 74)×10=...

1 m = 100cm...
1cm = (1÷100) m
So 45.5 cm = 45.5 ×(1÷100) =....

1km = 1000m
1m = 100 cm
1cm =10mm
So 1km = 1000×100×10 mm
Now convert