CBA 2

How many molecules are in 0.500 mol of N₂O₅?

• 1.20 x 10²³ molecules

• 1.20 x 10²⁴ molecules

• 3.01 x 10²³ molecules

• 3.01 x 10²⁴ molecules

3Mg + N₂ → Mg₃N₂

Using the equation above, a 9.27g sample of N₂ reacts completely. How much Mg was used? Molar mass of N₂ = 28 g/mol. Molar Mass of Mg is 24.3 g/mol

• 0.993 g

• 2.65 g

• 3.09 g

• 24.1 g

BaBr₂ + K₂SO₄ → 2KBr + BaSO₄

How many moles of KBr will be produced if 4 moles of BaBr₂ are used?

• 8 moles

• 6 moles

• 4 moles

• 2 moles

2H₂ + O₂ → 2H₂O

How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?

• 18 g

• 45 g

• 90 g

• 160 g

What is the pressure in atm of 2.50 moles of a gas at 200°C that occupies 8.1 L?

• 5.07 atm

• 11.99 atm

• 332.5 atm

• 786.4 atm

In which flask would the pressure be the lowest?

• Flask 1

• Flask 2

• Flask 3

• Flask 4

The initial pressure of the gas in the cylinder was 3,060 mmHg. The gas expands as the piston moves up.

What is the final pressure of the gas after the expansion?

• 544 mm Hg

• 784 mm Hg

• 2,898 mm Hg

• 3,230 mm Hg

What is the molarity of 600 mL of solution in which 3.0 moles of sodium bromide is dissolved?

• 0.005M

• 1.8 M

• 5 M

• 1,800 M

What volume of 1.0 M sodium phosphate, to the nearest tenth of a liter, must be used to make 4.0 L of 0.80 M sodium phosphate?

• 3.2 L

• 5.0 L

• 320 L

• 500 L

Which of the following is an expression of molarity?

Tags

NGSS.HS-PS1-5