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

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

How many molecules are in 2.00 moles of H₂O?

• 124x10²⁴ molecules of H₂O

• 1.20x10²³ molecules of H₂O

• 12.04 x10²³ molecules H₂O

• 124

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

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

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

• 112 dm³

• 112 cm³

• 120 L

• 120 mL

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

How many Mg ²⁺ ions are found in 1.00 mol of MgO?

• 3.01 x 10 ^23

• 12.04 x 10 ^23

• 6.02 x 10 ^23

• 6.02 x 10 ^25

How many Mg atoms are present in 3.00 moles of MgCl2 ?

• 1.81 x 10^24

• 3.02 x 10^24

• 12.0 x 10^25

• 16.0 x 10^23