Three mixtures are prepared from three very narrow molar mass distribution polystyrene samples with molar masses of 10,000, 30,000, and 100,000 g/mol as indicated below:
a. equal numbers of molecules of each sample
b. equal masses of each sample
c. by mixing in the mass ratio 0.145: 0.855 the two samples with molar masses of 10,000 and 100,000 g/mol.
1. for each of the mixtures, calculate the number-average and weight-average molar masses.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

14 days is the half-life of phosphorus-32