Unit 6 Test Review

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³ molecules

• 146 molecules

• 4.15 molecules

• 1.51x10²⁴ molecules

What is the molar mass of carbon dioxide?

• 12.40 g/mol

• 16.55 g/mol

• 32.21 g/mol

• 44.01 g/mol

How many moles are in 74 g of KCl?

• 0.99 mole

• 0.014 mole

• 11 moles

• 0.14 mole

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Tags

NGSS.HS-PS1-7

How many moles are in 1.24x10²³ molecules of CH₄?

• 6.02x10²³ moles

• 7.46x10⁴⁶ moles

• 978 moles

• 0.206 moles

Which of the following is an empirical formula?

• Mg₂O₂

• C₆H₁₂O₆

• H₂O

• C₂H₄

How many grams are in 0.36 moles of CCl₄?

• 150 g

• 55 g

• 0.0023 g

• 2.2 g

What are the units for molar mass?

• grams

• amu

• grams/mol

• liters

A chemical formula that shows the actual number and kinds of atoms present in a compound is called

• Ionic formula

• Covalent formula

• Empirical formula

• Molecular formula

How many atoms would be contained in 454 grams of iron?

• 6.02x10²³ atoms

• 8.14 atoms

• 4.89x10²⁴ atoms

• 55.9x10²³ atoms