Mole Concept

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃? (Atomic mass of Al = 27, H= 1, O = 16)

• 1.26 moles

• 0.8 moles

• 7,673.4 moles

• 150 moles

How many atoms are contained in 25 g of NaBr? (Atomic mass of Na = 23, Br = 35)

• 102.96 molecules

• 0.24 molecules

• 1.45x10²³ molecules

• 2.34 x 10²⁰molecules

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.0500 moles
• 1.81 x 10⁴⁶ moles
• 5.00 x 10²¹ moles
• 5.00 moles

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

• 28.2 g

• 55.8 g

• 6.02 g

• 1.2 g

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

• 28.2 g

• 55.8 g

• 6.02 g

• 1.2 g

What is the volume of 5 moles of oxygen gas at room temperature?

• 112 dm³

• 112 cm³

• 120 L

• 120 mL

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

A container with a volume of 893 L contains how many moles of air at STP?

• 2.5 x 10^-2 mol

• 39.9 mol

• 22.4

• 2.7 x 10^-2 mol

How many gram is 0.5 mol of Copper atoms? (Cu:63,5g/mol)

• 63,5 g
• 6,35 g
• 31,75 g
• 3,175 g