Ihave the question
how many moles of cao are produced as 0.248 moles of caco3 (s) is heated?

0.248 moles of CaO are produced.

Explanation:

Moles of calcium carbonate = 0.248 moles

According to reaction, 1 mole of calcium carbonate gives 1 mole of calcium oxide and 1 mole of carbon dioxide.

Then 0.248 moles of calcium carbonate will give:

of calcium oxide

0.248 moles of CaO are produced.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally