1. How many atoms are there in 24 grams of calcium? 2. What is the mass of one mole of calcium carbonate, CaCO3? will provide Fave answer?

Question

With Solutions Pls

1. How many atoms are there in 24 grams of calcium?

2. What is the mass of one mole of chalk that is made from calcium carbonate, CaCO3?

3. The rating of some fuels depends on the %H in their composition. Given these: A) CH4O (methanol) ; B) C2H5OH (ethanol); C) C3H6O (acetone). Which of the following is the correct sequence when the following %H are arranged in decreasing order.

Answer 1

1. Number n = (24g Ca) * (1 mol Ca /40.1g Ca) * (6.022 x 10²³ particles/mol) = 3.6 x 10²³ atoms of Ca.
2. One mole of CaCO₃ has a mass of 40.1 + 12.0 + 3*16.0 = 100.1 g (just add the atomic masses).
3. A) Per mole, CH₄O has H mass of 4.03g compared to molecular mass of 32.03g -> 12.6%

B) Per mole, C₂H₅OH has H mass of 6.05g compared to molecular mass of 46.05g -> 13.1%

C) Per mole, C₃H₆O has H mass of 6.05g compared to molecular mass of 58.05g -> 10.4%

So ranked in decreasing order it is C₂H₅OH, CH₄O, C₃H₆O.