In chemistry, a "mole" is:

• The mass of an atom
• a large number used to count particles
• based on the volume of a substance

Avogadro's number of representative particles is equal to one_____.

• kilogram
• gram
• kelvin
• mole

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

The mass of one mole of a substance is called...

• molar number

• mole constant

• molar mass

• atomic weight

Which list of number of atoms in Mg(NO₂)₂ is right?

• Mg =1 NO = 2

• Mg =1 N= 6 O=2

• Mg=1 N=1 O=2

• Mg=1 N=2 O=4

What would be the mass of 1.5mol H₂O if it's molar mass is 18g

• 20g

• 27g

• 32g

• 40g

What is the molar mass of NaCl?

(Na Mr = 22.99 g/mol and Cl Mr = 35.45 g/mol)

• 58.44g/mol

• 28g/mol

• 12g/mol

• 6.02 x 10²³

Molar mass of NaOH is _______________?

(Mr's of each element: Na = 23g, O = 16g, H = 1g)

• 40 grams/mol

• 50 grams/mol

• 45 grams/mol

• 38 grams/nol

How many moles are there in 12.7g of CaF₂?

(CaF₂ Molar mass = 78.07 g/mol)

• 0.20 mol

• 1,000.76 mol

• 6.14 mol

• 0.16 mol

Moles of H₂PO₄ in 20g?

(Molar mass of H₂PO₄ = 96.987 g.mol)

• 0.206 mol

• 0.103 mol

• 0.412 mol

• 8 mol