Stanek's Mole

How many moles are in 7.53 x 10^24 atoms of calcium?

12.51 moles = 7.53 x 10^24/6.02 x 10^23

What is the molar mass of glucose, C6H12O6?

180.16 g/mol - don't forget your units

How many atoms are in 3.5 moles of arsenic atoms?

2.1 x 10^24 atoms = (3.5 moles x 6.02 x 10^23 atoms)

What is the molar mass of iodine?

253.8 g/mol (did you forget this is I2?)

What is the percent carbon in glucose?

40.00% (72.06g C/180.16 g/mol) x 100 = 39.9977%

How do you find the percent composition of an element in a compound?

Divide total mass of element by molar mass of compound and then multiply by 100, the unit is %

What is the percent of oxygen in glucose?

53.29%; (96.0 g O2/180.16 g/mol) x 100 =53.29%

What is the molar mass of sodium chloride, NaCl?

58.44 g/mol

One mole is equal to

6.02 x 10^23 "things" and 12.000 g of carbon-12 atoms

To find the mass from a given number of moles, you would

multiply by the molar mass of the element or compound

Avogadro's number

number of representative particles in a mole, 6.02 X 10^23

Mole

the SI base unit used to measure the amount of a substance

How do you calculate molar mass?

add the masses of all the individual atoms in a chemical formula together

To find the number of moles from the mass, you would

divide by the molar mass of the element or compound