How many number of mol of nitrogen in 0.40 mol of caffeine

What is the standard unit of measure for acceleration?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.