Question

calculate the mass of 0.50 moles of Ca atoms​

Answer 1

Explanation:

Moles of oxygen in 0.5 mol of CaCO3 is 1.5 mole. 1 mole of CaCO3 gives 1 mole of CaO and 1 mole of oxygen. Any substance has molecular mass in 1 mole so mass of 1 mole CaCO3 is 100 gram. Contribution of oxygen in CaCO3 is 316 = 48 grams.

Answer 2

Answer:

Approx.

20

⋅

g

Explanation:

1

mole

of calcium atoms have a mass of

40.08

⋅

g

⋅

m

o

l

. It follows that

0.5

⋅

m

o

l

×

40.08

⋅

g

⋅

m

o

l

−

1

=

?

?

g

.

What is the number of calcium atoms that has this mass?