The formula of ferric sulphate is:

The molecular mass of an organic monobasic acid is $129$ and the value of $n$ is $2$. What is the empirical formula mass of the compound?

In each molecule of carbon tetrachloride,the mass percent of carbon and chlorine respectively are

An organic compound contains $60\ \%\ C$,$4.48\ \%\ H$,and $35.5\ \%\ O$. Its empirical formula is:

$64 \, g$ of an organic compound contains $24 \, g$ of carbon,$8 \, g$ of hydrogen,and the rest oxygen. The empirical formula of the compound is

Hemoglobin in red blood cells contains $0.33\%$ iron by mass. The molecular weight of hemoglobin is $67000$. What is the number of iron atoms present in each molecule of hemoglobin? (Atomic mass of $Fe = 56 \ g/mol$)