Mole Calculation

Calculate the number of moles of sodium hydroxide in 25cm³ of a 80 g/dm³ solution.

• 0.050 mol

• 0.10 mol

• 0.50 mol

• 0.010 mol

Tags

NGSS.HS-PS1-7

What is the mass of one mole of aluminum chloride?

• 62.5g

• 116.4g

• 133.3g

• 98g

Carbon dioxide gas and water vapour have molar masses of 44 g/mol and 18 g/mol respectively. Which statement(s) about these gases is/are correct?

• At the same temperature and pressure, they occupy the same volume

• At the same temperature and pressure, they occupy different volumes

• Samples of equal volumes of each gas would contain different no.s of moles of each gas

• Samples of equal volumes of each gas would contain the same no.s of moles of each gas

Tags

NGSS.HS-PS1-7

Which option shows the correct working steps to determine the number of moles in a 12 dm³ sample of Cl₂ gas at r.t.p?

• (12/35.5) moles

• (12/71) moles

• (12/24) moles

• (12 x 71) moles

At 100°C, the molar volume of gases is 30 dm³. Calculate the volume of 0.35 moles of steam produced from boiling water.

• 8.4 dm³

• 10.5 dm³

• 3.5 dm³

• 6.3 dm³

The concentration of a potassium nitrate solution is 50 g/dm³. Which option accurately converts this value to obtain the concentration in mol/dm³?

• 50/101

• 50/53

• 50/101 x 1000

• 50/53 x 1000

What is the concentration of the calcium chloride solution in mol/dm³?

• 0.414 mol/dm³

• 0.207 mol/dm³

• 4.14x10^-3 mol/dm³

• 2.07x10^-3 mol/dm³

Tags

NGSS.HS-PS1-5

Calculate the number of particles (atoms) in 0.250 moles of silver.

• 1.62 x 10²⁵ atoms Ag

• 4.15 x 10^-25 atoms Ag

• 1.51 x10²³ atoms Ag

• 27.0 atoms Ag

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 456 grams

• 452 grams

• 462 grams

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 1

• 2

• 3

• 6

Tags

NGSS.HS-PS1-7