Does anyone know a website where it solves me these types of problems OR if someone can help me with them?

How many grams of rust (Fe2O3) would be produced by the complete reaction of 0.15 grams of iron metal?
4 Fe + 3 O2 -> 2 Fe2 O3

What shape would a molecule with two bound groups and two lone pairs have?

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive