Moles

Balance the following reaction:
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)

• 1,2,1,2
• 2,1,1,2
• 1,2,1,1
• 1,2,2,2

A mole of potassium chloride contains 6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titanium?

• 1 g Ti / 47.84 mol Ti
• 1 mol Ti / 47.84 g Ti
• 47.84 mol / 1 g Ti
• 47.87 g Ti / 1 mol Ti

Which compound has the smallest molar mass?

• CO
• CO₂
• H₂O
• H₂O₂

Which has a greater mass: 1 mole of scandium or 2 moles of boron?

• scandium
• boron
• neither
• more information is needed.

What is the mass in grams of 6.25 mol of copper (II) nitrate?

• 126 g
• 785 g
• 625 g
• 1172 g

What is the mass of 2.50 mol of oxygen gas O₂?

• 40 g
• 80 g
• 16 g
• 32 g

Avogadro's number of representative particles is equal to one_____.

• kilogram
• gram
• kelvin
• mole

What do we call the SI unit for amount of a substance?

• Avogadros number
• kilogram
• mole
• liter

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g