what is the empirical formula of a compound containing 20.11% H and 79.89% C?

Consider following reaction: 4 Al (s) + 5 O2(g) ? 2 Al2O5(s) What mass of Al2O5 (in grams) is produced from the reaction of 5.00 moles of Al and 96.0 g O2 if the reaction results in a 75.0% yield?

what is the empirical formula of a compound that is 13.5% calcium, 10.8% oxygen . and 0.675% hydrogen by mass

What is the empirical formula for a compound that is 36.1% Ca and 63.9% Cl?

molecular formula of a compound of 66.6 % Carbon, 11.2 % Hydrogen, and 22.2% Oxygen with a molar mass of 72.12 amu?

What is the empirical formula of a compound containing 37.51% carbon, 4.20% hydrogen, and 58.29% oxygen?

A certain compound has an empirical formula of C2H6OSi and a molecular weight of 593.236 amu.  Determine the molecular formula of this compound.

An iron-containing compound is 20.1% Fe, 11.5% S, 63.3% O, and 5.1% H. What is the empirical formula for this compound?

Determine the molecular formula of a sugar from its percent composition of 40.0% C, 6.67% H, 53.3% O, and its molar mass of 180 g/mol.

A compound with a composition of 87.5% N and 12.5% H was recently discovered. What is the empirical formula for this compound?