Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

Tags

NGSS.HS-PS1-7

What is the definition for Avogadro's number?

• number of grams per one mole of a substance
• whole number ratio that is a multiple of a chemical formula
• simplest, whole number ratio of a chemical formula
• 6.02 x 10^23 particles per one mole of a substance

What is the molar mass of Cl₂?

• 17 g/mol

• 35.5 g/mo;

• 71.0 g/mol

• 89 g/mol

Calculate the molar mass of CO₂.

• 14 g/mol

• 28 g/mol

• 36 g/mol

• 44 g/mol

Calculate the molar mass of water (H₂O).

• 10 g/mol

• 17 g/mol

• 18 g/mol

• 34 g/mol

What is the molar mass of sodium?

• 11
• 23
• 45.98
• 3

What is the mass of 4.5 x 10²⁵ of molecules of Helium He?

• $\frac{\left(4.5\cdot10^{25}\right)}{\left(4\right)}\cdot\left(6.02\cdot10^{23}\right)$

• $\frac{\left(6.02\cdot10^{23}\right)}{\left(4\right)}\cdot\left(4.5\cdot10^{25}\right)$

• $\frac{\left(4.5\cdot10^{25}\right)}{\left(6.02\cdot10^{23}\right)}\cdot4$

How many molecules are in 35.6 g of CO?

Which of the following is the correct formula?

• $\frac{35.6}{28}\cdot\left(6.02\cdot10^{23}\right)$

• $\frac{28}{35.6}\cdot\left(6.02\cdot10^{23}\right)$

• $\frac{28}{\left(6.02\cdot10^{23}\right)}\cdot35.6$

How many molecules are in 60.4 g of Nitrogen N?
Which of the following is the correct formula?

•  $\frac{14}{60.4}\cdot\left(6.02\cdot10^{23}\right)$  

•  $\frac{60.4}{14}\left(6.02\cdot10^{23}\right)$  

•  $\frac{60.4}{\left(6.02\cdot10^{23}\right)}\cdot14$  

Determine the mass of 3.78x10²⁴ atoms of CO₂.

Which of the following is the correct formula?

• $\frac{\left(6.02\cdot10^{23}\right)}{\left(3.78\cdot10^{24}\right)}\cdot44$

• $\frac{\left(3.78\cdot10^{24}\right)}{44}\left(6.02\cdot10^{23}\right)$

• $\frac{\left(3.78\cdot10^{24}\right)}{\left(6.02\cdot10^{23}\right)}\cdot44$

• $\frac{\left(3.78\cdot10^{24}\right)}{\left(6.02\cdot10^{23}\right)\cdot44}$