Chem Calc

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

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

How many particles (atoms) would be in 8.4 moles of Octane (C₈H₁₈)?

• 5.77 x 10²³
• 5.04 x 10²⁴
• 5.77 x 10²⁶
• 5.04 x 10²³

Which has more molecules?

• 1 mole H₂O
• 1 mole Al(OH)₃
• 1 mole NaCl
• There are all the same

What is the volume occupied by 1 mole of any gas at RTP?

• 44.8 dm3

• 22.4 dm3

• 16.8 dm3

• 24 dm3

What is the volume of 5 moles of oxygen gas at RTP?

• 112 dm3

• 22.4 dm3

• 120 dm3

• 24 dm3

what is the temperature and pressure at RTP ?

• 25 ⁰C and 100 atm

• 25 ⁰C and 1 atm

• 0 ⁰C and 1 atm

• none of these

What volume of hydrogen will be produced at RTP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?

1Mg + 2H₂O --> Mg(OH)₂ + H₂

Ar values: Mg=24.3, H=1, O=16

• 66.5 dm3

• 65 dm3

• 31 dm3

• 124 dm3

• 11.2 moles

• 0.5 moles

• 179.2 moles

• 27.2 moles

What volume of hydrogen will be produced at RTP by the reaction 67.3 g of magnesium with excfess water according to the following reaction? 1Mg + 2H₂O --> Mg(OH)₂ + H₂

• 67L

• 65L
• 62L

• 124L

How do I move from grams to moles

• multiply by molar mass
• divide by molar mass
• multiply by Avo number
• divided by Avo number