Question

Which has more number of atoms? 100g of Ca (Calcium) or 100g of Al (Aluminium)?

Answer 1

Answer:

Aluminium.

Explanation:

for this problem, you need the avogadro number. it's a constant. the avogadro number tells you how many particles there are in a mole. that's why a mole is called the chemists dozen. 1 mole = 6.02 x 10^23, which is the avogadro number.

n(amound of moles)=m(mass) / mw(molecular weight)

before calculating, you also need the molecular weights of calcium and aluminum.

the molecular weight of ca= 40.078

the molecular weight of al=26.98

now put the values in the formula, don't forget to round them up.

n=100/40.078=2.49513449=2.5

n=100/26.98=3.70644922=3.7

Al is higher in the moles, so that's your answer.