2. The color of blue light has an energy (E) of 6.62 x 10-19 J. What is the wavelength of the blue light?

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.)

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer.