Hydrogen gas, h2, reacts with nitrogen gas, n2, to form ammonia gas, nh3, according to the equation

3h2(g)+n2(g)→2nh3(g)

a. how many moles of nh3 can be produced from 18.0 mol of h2 and excess n2?
b. how many grams of nh3 can be produced from 3.46 mol of n2 and excess h2.
c. how many grams of h2 are needed to produce 13.36 g of nh3?
d. how many molecules (not moles) of nh3 are produced from 1.49×10−4 g of h2?

the answer for sodium is 0.186

the answer for rubidium is 0.251

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