What is the molar mass of a substance? the mass in grams of one mole of a substance the number of particles in one gram of a substance the number of moles in one gram of a substance the mass in grams of one particle of a substance

Answer : The correct option is, the mass in grams of one mole of a substance.

Explanation :

Molar mass of a substance : It is defined as the amount of a substance present in one mole of substance. The unit of molar mass is, gram/mole or g/mole.

For example : The molar mass of calcium (Ca) is, 40 g/mole this means that the in one mole of a substance, 40 grams of calcium are present. Or we can say that 40 grams of a calcium present in one mole of a substance.

Hence, the correct option is, the mass in grams of one mole of a substance.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8