How many moles of Fe were used when producing 13.5 moles Fe2O3?

The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.

Hno2 + caco3 = h2co3 + ca(no2) can someone balance this

What is the density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?