Which is the molar mass of oxygen, O₂ (g)?

• 15.999 g/mol

• 31.998 g/mol

• 7.995 g/mol

• 6.02 × 10²³ g/mol

Which is the molar mass of copper (II) nitrate, Cu(NO₃)₂?

• 125.55 g/mol

• 173.55 g/mol

• 187.55 g/mol

• 251.10 g/mol

Which is the correct set of coefficients for the following chemical equation when it is balanced in accordance with the law of conservation of mass? C₃H₈ (g) + O₂ (g) → H₂O (l) + CO₂ (g)

• 2, 5, 4, 1

• 1, 10, 4, 3

• 2, 10, 4, 3

• 1, 5, 4, 3

Tags

NGSS.MS-PS1-5

How many moles of Al₂(SO₄)₃ are in 87.9 g?

• 0.257 mol

• 0.316 mol

• 3.89 mol

• 342 mol

Tags

NGSS.HS-PS1-7

Which conversion factor corresponds to b) on the diagram?

• 40.078 g/1 mol

• 6.02 × 10²³ atoms/1 mol

• 1 mol/40.078 g

• 1 mol/6.02 × 10²³ atoms

Tags

NGSS.HS-PS1-7

How many moles of KBr will be produced from 7 moles of BaBr₂?

• 7 moles

• 14 moles

• 1 mole

• 3.5 moles

How many moles of carbon dioxide are produced when 10.4 mol of propane gas is burned in excess oxygen?

• 52.0 mol

• 31.2 mol

• 3.46 mol

• 0.288 mol

What is the mass of potassium chloride when 6.75 g of potassium reacts with an excess of chlorine gas?

• 6.45 g

• 25.7 g

• 5.79 g

• 12.9 g

The accepted value for a quantity is 5.67 g. If the measured value is 5.89 g, what is the percent error?

• 3.9%

• 3.5%

• 3.74%

• 3.88%

Which is an example of a chemical change?

• extracting iron fillings from a mixture using a magnet

• grinding medication into a fine powder

• grill marks forming on a hamburger being barbequed

• the formation of clouds

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5