Molar Mass and Moles in Chemistry

What is the approximate number of "things" represented by one mole in chemistry?

• 12

• 6 x 10^23

• 1 x 10^23

• 600

How is the molar mass of an element determined from the periodic table?

• It is the atomic number of the element.

• It is the atomic weight of the element, expressed in grams per mole.

• It is always 1 gram per mole for any element.

• It is calculated by multiplying the atomic number by 2.

How many moles of lithium are present in 25 grams of lithium? (Atomic weight of Lithium = 6.94 g/mol)

• 0.278 moles

• 3.60 moles

• 173.5 moles

• 25 moles

What is the molar mass of carbon monoxide (CO)? (Atomic weight of Carbon = 12.01 g/mol, Oxygen = 16.00 g/mol)

• 12.01 g/mol

• 16.00 g/mol

• 28.01 g/mol

• 44.01 g/mol

How many moles of magnesium nitrate were present? (number only no units)

(a)  

The given information in the second problems is

• moles

• grams

• molecules

• there is no given