A hydrocarbon contains 82.76% carbon by mass. If 0.90 g of the hydrocarbon occupies a volume of 390 $cm^3$ at STP, what is its molecular formula?

A compound containing only carbon, hydrogen, and oxygen has a molar mass of approximately 90 g/mol. Combustion analysis of 0.405 g of the compound produces 0.54 g $CO_2$ and 0.27 g $H_2O$. If the compound's empirical formula is the same as its molecular formula, what is the number of oxygen atoms in one molecule of the compound?

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

An organic compound contains 90% Carbon and 10% Hydrogen by mass. Its empirical formula is

The empirical formula of naphthalene is:

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

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 compound contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen. Its empirical formula is:

Consider the following reaction: $xMnO_4^ - + y{C_2}O_4^{2 - } + z{H^ + } o xM{n^{2 + }} + 2yC{O_2} + \frac{z}{2}{H_2}O$

The values of x, y and z in the reaction are, respectively

An oxide of metal M contains 70% of the metal (atomic mass = 56u) and 30% oxygen (atomic mass = 16u). Determine the empirical formula of the metal oxide.

A hydrocarbon contains 85.7% carbon. Its molecular mass is 42. The molecular formula of the compound is: