How many number of particles are in 0.25 moles of CO₂ molecules?

• 1.505 x 10²³

• 6.025 x 10²³

• 1.00

• 0.25

What is the mass of 1 mol of NaCl compound?

• 23.3 g

• 35.5 g

• 58.5 g

• 94.0 g

What is the volume of 0.5 moles of hydrogen if oxygen and nitrogen gas, all occupy a volume of 22.4 L at STP?

• 5.60 L

• 11. 20 L

• 22.4 L

• 24.0 L

What is the molar mass of (NH₄)₃PO₄ ?

• 149.1 gmol^-1

• 149 g

• 242 gmol^-1

• 242 g

Calculate the mass of 3 x 10²³ copper atoms.

• 31.6 g

• 31. 8 g

• 127.4 g

• 127.5 g

What is molarity of 6.16 g of NaOH in 50 mL of solution?

• 2.10 M

• 0.10 M

• 3.08 M

• 0.003 M

Concentrated of hydrochloric acid is 12.0M. What volume of concentrated hydrochloric acid is required to prepare 4.50L of 1.80 M HCl?

• 148 mL

• 675 mL

• 30 mL

• 0.0675 mL

What is the volume occupied by 2.50 g of carbon monoxide, CO gas at RTP?

• 2 L

• 2.14 L

• 1.27 L

• 2.08 L

Calculate the number of hydrogen atoms in 124.8 g of methane, CH₄.

• 6.02 x 10²³ atoms

• 2.35 x 10²⁵ atoms

• 4.70 x 10²⁴ atoms

• 1.88 x 10²⁵ atoms

How many grams of solute are present in 700 mL of an aqueous solution of 0.5M KOH?

• 28 g

• 39.2 g

• 19.6 g

• 50.2 g