Mole Questions

A student calculated the number of moles of methane (CH4) present in a 100g sample of a gaseous mixture. If the student determined that there’s 0.6 moles of methane present in the sample, what is the percent composition of methane in the sample?

• .096%

• 9.6%

• .9%

• 90%

Tags

NGSS.HS-PS1-7

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅

• C₄H₁₀

• C₁H_2.5

• C₄H₈

How many moles does 3.01 x 1023 atom of Neon contain?

• 0.3 moles

• 0.4 moles

• 0.5 moles

• 0.6 moles

How many moles are in 1.20 x 1024 molecules of H₂O?

• 2.06 moles

• 3.06 moles

• 4.06 moles

• 5.06 moles

How many grams are in 2.06 moles of H2O?

• 35.12 g

• 36.12 g

• 37.12 g

• 38.12 g

How much is 0.5 mole of Neon equivalent to in grams?

• 9.09 g

• 10.09 g

• 11.09 g

• 12.09 g

Read the questions carefully and choose the best answer.

Avogadro’s number of atoms of any element is equivalent to

• the atomic number of that element

• 6.02 x 10²³ particles

• the mass number of that element

• 100g of that element

How can the knowledge about mole be useful for the environmentalists?

• Mole concept can be used in environmental monitoring.

• It gives information on the most dangerous pollutant in the atmosphere

• It gives a feedback on the kinds of pollutants present in the atmosphere.

• Mole concept can be used in quantifying the amount of pollutant-particles released in the

  atmosphere.

Tags

NGSS.HS-PS1-5

The mole is an experimentally-defined unit. One mole is the number of particles found in 12.000 grams of:

• Carbon-12

• carbon-14

• oxygen

• hydrogen

Read each question and choose the best answer. One gram molecule H₂O contains how many moles of molecules and number of molecules?

• 1 gram molecule H₂O = 1mol of molecule = 6.022 x 10 ²³ molecules of H₂O

• 1 gram molecule H₂O = 1.5 mol of molecule = 3.011 x 10²³ molecules of H₂O

• 1 gram molecule H₂O = 1.5 mol of molecule = 6.022 x 10 ²³ molecules of H₂O

• 1.5 gram molecule H₂O = 1mol of molecule = 6.022 x 10 ²³ molecules of H₂O

Tags

NGSS.HS-PS1-7