The proportions of substances in a mixture O are always equal for each substance in the mixture
O can vary among the substances
O never can be determined accurately
O are always the same for each substance
2 points

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?