How many significant figures does the result of the followin…

How many moles of NH3 are there in 77.5 g of NH3?

 Liquid nitrogen boils at –195.8°C. Express the boiling poin…

Calculate the boiling temperature of a solution made by mixi…

Express the number 0.000053 in scientific notation.

The diameter of Earth is 12.7 Mm.  Express this diameter in…

How many square kilometers are equivalent to 28.5 cm2?

Formaldehyde has the formula CH2O.  How many molecules are t…

A barrel of oil contains 42.0 gallons.  How many liters is t…

The following initial reaction rates were observed for the r…