During an effusion experiment, oxygen gas passed through a tiny hole 2.5 times faster than the same number of moles of another gas under the same conditions. what is the molar mass of the unknown gas? (note: the molar mass of oxygen gas is 32.0 g/mol.) 2.0 × 102 g

Gymnast always perform on padded mats. how does the mats protect the gymnast

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

Calculate the mass of 0.750 mol of the following substance. na3po4.