Which of the following pairs has the same empirical formula?

A compound Y contains 16% of element P (atomic mass = 32 u), 4% of element Q (atomic mass = 16 u), and the rest is element R (atomic mass = 12 u). What is the empirical formula of compound Y?

Two organic compounds X and Y have the same empirical formula $CH_2O$. Compound X has a molar mass of 30 g/mol while compound Y has a molar mass of 90 g/mol. If 0.3 moles of X contains the same number of oxygen atoms as 'm' grams of Y, what is the value of 'm'?

A substance contains 24% carbon and 76% fluorine by weight. What is the empirical formula of this substance? (Atomic weights: C=12, F=19)

The empirical formula of glucose is CH$_2$O. If its molecular weight is 180, what is the molecular formula of glucose?

A nitrogen oxide contains 30.43% nitrogen by mass. Which of the following could be its molecular formula?

A hydrocarbon contain , the vapour density of compound is 30, empirical formula of compound is

The formula of a compound which gives simple whole number atomic ratio in one molecule of a compound is called:

A compound has the molecular formula C$_2$H$_4$O$_2$. What is its empirical formula?

A compound contains 4.07 % Hydrogen, 24.27 % carbon and 71.65 Chlorine, its empirical formula is

If a compound consists of 92.3% carbon and 7.7% hydrogen by weight, what is its empirical formula? (Atomic weights: C = 12, H = 1)