moles, mass, number of atoms

moles

by Manal Sharaf

Multiple Choice

Determine the mass of 4.20 moles of C₆H₁₂

• 353 g

• 0.0499 g

• 337 g

• 2.53 x 10²⁴ g

Multiple Choice

What is the mass of 1.2 x 10²⁴ atoms of C?

• 2.0 grams

• 24 grams

• 0.17 grams

• 1.4 x 10²⁵ grams

Multiple Choice

Which has more number of particles, 1g of gold Au-197, Silver Ag-108, platinum Pt- 195, or palladium Pd- 106? 

• Au

• Ag

• Pt

• Pd

Multiple Choice

The dome, an architectural marvel, is also known as the heart of Expo 2020 and the jewel of the site.It encloses a space of 724,000 cubic metres — the volume of almost 300 Olympic-size swimming pools — and stands taller than the Leaning Tower of Pisa. It uses 550 tonnes of moulded steel. Knowing that mould steel type P5 contains 0.1 % Carbon by mass, what do you expect the number of moles of carbon C found in the dome?

• $$4.58\times10^4\ mole$$  

• $$4.58\ \times10^7\ mole$$  

• $$9.16\ \times10^{4\ }mole$$  

• $$9.16\ \times10^{7\ }mole$$  

Multiple Choice

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

• 112L

• 120L

• 22.4L

• 24L

Multiple Choice

The density of a gaseous compound is found to be 0.982 g/L at STP. What is the molar mass of the compound?

• 22

• 33

• 44

• 55