How much faster does helium (M = 4.003 g/mol) escape through an edifice than nitrogen gas (M - 28.01 g/mol) escapes through the edifice? A 2.6 times
B. 5.2 times
C. 7 times
D. 14 times

Determine the reaction and balance the following equations urgent due in the morning

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

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