How many atoms are in `4.0 xx 10^(-5)` gams of Al?

How many moles are 9.033 xx 10^(24) atoms of helium (He) ?

How many times 5 is 15 ?

How many Ag atoms are there in 0.001 g of silver? Take atomic mass of Ag = 108 and Avogadro's number = 6.023xx10^(23) .

How many atoms of fluorine are there in 1.9 xx 10^(-6) gms of fluroine ? (F = 19 amu)

How many atoms are there in 5 moles of silver (N_(A)=6xx10^(23))

How many atoms of fluorine are there in 1.9 xx 10 ^(-6) gram of fluorine (F=19 amu)

How many times 5 Is 30 ?

One atom of an element weigs 6.644xx10^(-26) kg.How many gram atoms are present in 40kg of the element ?