Estimate δg°rxn for the following reaction at 449.0 k. ch2o(g) + 2 h2(g) → ch4(g) + h2o(g) δh°= -94.9 kj; δs°= -224.2 j/k

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.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Which of the following is a physical property flammability heat of combustion solubility and toxicity