Question

# How many GRAMS of cobalt(II) are present in 3.75 grams of cobalt(II) carbonate ? How many...

How many GRAMS of cobalt(II) are present in 3.75 grams of cobalt(II) carbonate ?

How many GRAMS of cobalt(II) carbonate can be made from 2.28 grams of cobalt(II) ?

How many GRAMS of calcium are present in 3.05 grams of calcium sulfite ?

How many GRAMS of calcium sulfite can be made from 1.13 grams of calcium ?

1) How many GRAMS of cobalt(II) are present in 3.75 grams of cobalt(II) carbonate ?

cobalt(II) carbonate molar mass = 119 g/mol

119 g cobalt(II) carbonate ----------------------------> 58.93 g Co(II)

3.75 g cobalt(II) carbonate -----------------------> 58.93 x 3.75 /119 = 1.86 g

Co (II) mass = 1.86g

2) How many GRAMS of cobalt(II) carbonate can be made from 2.28 grams of cobalt(II) ?

119 g cobalt(II) carbonate ----------------------------> 58.93 g Co(II)

x g cobalt(II) carbonate -----------------------> 2.28g Co(II)

x = 119 x 2.28 / 58.93 = 4.6 g

cobalt(II) carbonate = 4.6 g

3) How many GRAMS of calcium are present in 3.05 grams of calcium sulfite ?

CaSO3 molar mass = 120 .14 g /mol

120 .14 g CaSO3 --------------------> 40.08 g Ca

3.05 g CaSO3 ------------------------> 3.05 x 40.08 / 120.14 = 1.02 g

Ca mass = 1.02 g

4) How many GRAMS of calcium sulfite can be made from 1.13 grams of calcium ?

120 .14 g CaSO3 --------------------> 40.08 g Ca

x g CaSO3 ------------------------>   1.13g Ca

CaSO3 mass = 120 .14 x 1.13 / 40.08 = 3.39 g

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