Moles and Avogadro's number

What is the molar mass of Mg₃N₂?

(At. mass of Mg=24.3 g, N= 14 g)

• 191.6 g/mol
• 76.64 g/mol
• 38.32 g/mol
• 100.95 g/mol

How many moles of carbon atoms are there in 5g of carbon?

(Molar mass of C= 12 g)

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

The number 6.02 x 10²³ is called...

• Lewis number

• Bohr's number
• Avocado's number

• Avogadro's number

What is the molar mass of NaCl?

(At. mass of Na=23g , Cl= 35.45 g)

• 58.45g/mol
• 28g/mol
• 12g/mol
• 6.02 x 10²³

What is the molar mass of C₂H₄O₂?

(At. mass of C=12g, H=1 g, O=16g)

• 40g
• 50g
• 60g
• 68g

Find the grams of compound of 0.75 moles of magnesium (Mg).

(Molar mass of Al=27 g)

• 32 grams
• 20.25 grams

• 2.21 x 10 ^23 grams

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

What is the molar mass of H₂O?

(At mass of H=1g , O=16 g)

• 6.02 x 10²³
• 17 grams

• 18 grams
• 15.99999 grams

How are a mole aluminum and zinc the same?

• they have the same number of atoms - 6.02 x 10²³

• they have the same molar mass

How many grams of Ne are in 1.2 moles of neon?

(Molar mass of Ne=20.2 g)

• 0.059 grams

• 7.2 x 10²³ grams

• 2.0 x 10^-24 grams

• 24.2 grams