The wavenumber of the fundamental vibrational transition of 79Br81 Br is 323.2 cm^−1. Calculate the force constant of the bond.

What layer of the atmosphere is directly above the troposphere?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)