To prevent a condition called the “bends”, deep sea divers breathe a mixture containing, in mole percent, 10.0% o2, 10.0% n2 , and 80.0% he.. a. calculate the molar mass of this mixture.. b. what is the ratio of the density of this gas to that of pure oxygen?

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

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.)

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added