Gold has a molar mass of 197 g/mol. (a) how many moles of gold are in a 3.98 g sample of pure gold? (b) how many atoms are in the sample?

What type of mountain are the andes mountains

Why can't subscripts be changed?

35 cm3 of a metal has a mass of 121 grams. whats is its density?

Which soil layer contains the most humus? A) A horizon B) B horizon C) C horizon D) D horizon

At what temperature celsius will 19.4g of molecular oxygen, o2, exert a pressure of 1820mm hg in a 5.12th cylinder?

Why electrons are transferred during the course of the reaction between magnesium and oxygen?

Human muscle stores sugars in the form of

How much heat is needed to raise the temperature of 75 g of a substance by 15 C when the specific heat is 0.92 J/g-C?

A nitric acid solution flows at a constant rate of 5L/min into a large tank that initially held 200L of a 0.5% nitric acid solution. The solution inside the tank is kept well stirred and flows out of the tank at a rate of 10L/min.

How many molecules are in 237g (about a cup of water)