A certain mass of nitrogen gas is added to a vessel of 405 mL containing 0.52 g oxygen. The gas pressure is increased from 745 mmHg to 980 mmHg. Assuming the temperature remains
constant and that the nitrogen gas does not react with oxygen gas, calculate the mass of
added nitrogen.

What is the composition, in atom percent, of an alloy that consists of 4.5 wt% pb and 95.5 wt% sn? the atomic weights for pb and sn are 207.19 g/mol and 118.71 g/mol, respectively.(a) 2.6 at% pb and 97.4 at% sn(b) 7.6 at% pb and 92.4 at% sn(c)97.4 at% pb and 2.6 at% sn(d) 92.4 at% pb and 7.6 at% sn

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)