When heated strongly, copper metal incorporates oxygen to form one of the copper oxides from the last problem. in one experiment, a crucible weighing 88.00 g was loaded with 10.00 g of copper metal. after 20 minutes of strong heating, the total mass was 100.52 g. how many moles of copper atoms are present in the final product?

1 mol of copper

Explanation:

The mass of the oxide formed is the total mass less the crucible mass, so it is:

100.52 - 88.00 = 12.52 g

It means that 10.00 g is from copper, and 2.52 g is from oxygen. The molar mass of copper is 63.50 g/mol, and the molar mass of oxygen is 16 g/mol. The number of moles (n) is the mass divided by the molar mass:

n Cu = 10.00/63.50 = 0.158 moles

n O = 2.52/16 = 0.158 moles

So, there is the same number of moles of each element, and the product must be: CuO, which has 1 mol of copper.

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2