N2H4 + N204 → H2O + N2 When 8.0 g of N H4 (with a molar mass of approximately 32 g/mol) and 92 g of N204 (with a molar mass of
approximately 92 g/mol) are mixed together and react according to the equation above, what is the maximum mass of
H2O that can be produced? Balance the equation first!

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Can someone me with questions 15 to 17 plz.