Question

What is the mass of 0.50 moles of calcium carbonate(CaCO3 )?
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Answer 1

Answer:

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:

50.0055 grams

Explanation:

Here's how

So, As we know:

"Mass = Mole x Molar Mass"

Mass: ?

Mole: 0.50 (as given in question)

Molar Mass: CaCO3 (as given in question)

To find molar mass, we have to add the atomic masses, meaning:

CaCO3

40.078 (Calcium's atomic mass) + 12.011 (Carbon's atomic mass) + 15.999(3) (Oxygens atomic mass multiplied by the power given '3')

Therefore adding, 40.078 + 12.011 + 15.999(3)

                            =100.011

So the Molar Mass is: 100.011.

Now we apply: "Mass = Mole x Molar Mass"

Mass = 0.50 x 100.11

Mass = 50.0055 grams

Hope this helped. I got the same question in my assignment. Good luck.