mole problems 2

What is Avogadro's Number? (measures molecules and atoms)

• 6.02 x 10²³

• 3.145

• it changes

• 1

How many molecules are in 100 g of NaCl?

• 6.02 x 10²³

• 58.44

• 1.03 x10²⁴

• 1.97 x 10²²

0.02 moles of potassium atoms has a mass of

• 5.11 g

• 39.098 g

• 0.782 g

• 6.022 x 10²³ g

What is the molar mass of H₂O?

• 6.02 x 10²³ grams

• 17.007 grams

• 18.015 grams

• 15.999 grams

If you are given 500g of Ag₃PO₄, how many moles does your sample contain?

• 418.58 mol

• 0.02 mol

• 1.19 mol

• 5.32 mol

How many moles are in 20 grams of Ca (Calcium)?

• 0.50 mol

• 6.02x10²³ mol

• 2 mol

• 20 mol

What is the mass when you have 4 moles of CO₂?

• 176 grams

• 54 grams

• 128 grams

• 280 grams

You have 150 grams of Oxygen (O₂)? How many moles is this?

• 9.38 mol

• 4.69 mol

• 0.21 mol

• 4,799.70 mol

What is the mass of 0.89 mol of CaCl₂?

• 67.22 grams

• 134.44 grams

• 98.77 grams

• 124.69 grams

How many atoms are in 1.00 mole of Au?

• 6.02 x 10²³

• 5.8 x 10²⁴

• 1.00 x10²³

• 79