Calculate the number of moles in 1.75 x10²⁴ formula units of NaCl.

• 1.05x10⁴⁸ mol NaCl

• 2.91 mol NaCl

• 5.81 mol NaCl

• 2.10x10⁴⁸ mol NaCl

Tags

NGSS.HS-PS1-7

Calculate the number of molecules in 2.35 moles of CO.

• 1.41x10²⁴ molecules CO

• 3.90x10^-24 molecules CO

• 7.80x10^-24 molecules CO

• 2.82x10²⁴ molecules CO

Calculate the number of atoms in .750 mol of Cu.

• 1.24x10^-24 atoms Cu

• 2.49x10^-24 atoms Cu

• 4.52x10²³ atoms Cu

• 9.03x10²³ atoms Cu

Calculate the number of atoms in 4.5 moles of HCl.

• 7.48x10^-24 atoms HCl

• 7.07x10²³ atoms HCl

• 1.41x10²⁴ atoms HCl

• 5.42x10²⁴ atoms HCl

Tags

NGSS.HS-PS1-7

The molar mass of water is 18.02 g/mol. How many moles is in 70.0 g of water?

• 3.88 mol

• 1261.4 mol

• 11.65 mol

• 1.29 mol

The density of a gas is 1.12 g/L. What is the molar mass of this gas?

• 22.18 g/mol

• 20.00 g/mol

• .05 g/mol

• 25.09 g/mol

Calulate the volume of .70 moles of hydrogen gas (H₂).

• 7.84 L

• 32.00 L

• 15.68 L

• .03 L

Calculate the number of moles in 12.00 L of gas.

• 3.73 mol

• 1.87 mol

• 268.80 mol

• .54 mol

The density of a gas is 1.75 g/L. What is the molar mass of the gas?

• 12.80 g/mol

• 25.60 g/mol

• 19.60 g/mol

• 39.20 g/mol

What is the volume of 3.75 moles of a gas?

• 84.00 L

• 5.97 L

• 42.00 L

• 22.40 L