Moles

What is a mole?

• A. the SI base unit for amount of a substance

• A. 6.02 x 10²³ of molecules, atoms or ions

• A. 12.011 grams of carbon

• all of the above

One mole of any element on the periodic table is equal to _____.

• its molar mass

• 6.02 x 10²³ atoms

• the concentration at 0.002 g/mol

• both molar mass and Avogadro's number of atoms

If I have one mole of carbon, how many carbon atoms do I have?

• one atom

• 12.011 grams

• 6.02 x 10²³ atoms

• two atoms

Tags

NGSS.HS-PS1-7

What is the mass of 4.50 moles of NaCl?

• 262.98 g

• 0.08 g

• 12.99 g

• 2.71 x 10²⁴ g

How many moles of Vanadium, V, are 2.58 x 10¹⁹ atoms of Vanadium?

• 4.28 x 10⁴³

• 0.002 moles

• 1.55 x 10⁴³ moles

• 4.29 x 10^-5 moles

What is the total number of atoms in a 2.5 mole sample of Radon gas?

• 1.51 x 10²⁴ atoms

• 4.15 x 10^-24 atoms

• 2.41 x 10²³ atoms

• 555 atoms

Calculate the number of moles in 45.2 grams of Lead (Pb).

• 2.72 x 10²⁵ moles Pb

• 9365.44 moles Pb

• 0.22 moles Pb

• 1.31 x 10²³ moles Pb

Tags

NGSS.HS-PS1-7

What is the molar mass of Ammonium Nitrate, NH₄NO₃?

• 66.05 g/mol

• 80.06 g/mol

• 48.06 g/mol

• 6.02 x 10²³ g/mol

How many molecules are in 310 grams of Potassium Bromide, KBr?

• 2.61 molecules

• 1.57 x 10²⁴ molecules

• 36,890 molecules

• 2.22 x 10²⁸ molecules

What is the mass of 7.4 x 10²² atoms of Boron?

• 0.12 g

• 4.45 x 10⁴⁷ g

• 4.12 x10⁴⁶ g

• 1.33 g