11 EM MOLE CONCEPT

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

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

What is the molar mass of NaCl?

• 58.45g/mol

• 28g/mol

• 12g/mol

• 6.02 x 10²³

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%

• 65.25%

• 32.6%

• 57.14%

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles
• 0.8 moles
• 7,673.4 moles
• 150 moles

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

Convert 25 g of NaBr to molecules

• 102.96 molecules

• 0.24 molecules

• 1.45x10²³ molecules

• 2.34 x 10²⁰molecules