Unit 3 Review

Avogadro's number of representative particles is equal to one_____.

• kilogram
• gram
• kelvin
• mole

How many atoms of iodine are in a mole of iodine atoms?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

If I have 1.5 moles of helium atoms, how many helium atoms do I have?

• 9.0 x 10²³ moles

• 9.0 x 10²³ atoms

• 4.0 x 10²³ atoms

• 2.5 x 10^-24 atoms

Tags

NGSS.HS-PS1-7

How many moles of FeCl₃ are in 3.0 x 10²⁴ formula units of FeCl₃?

• 5.0 moles

• 0.5 moles

• 0.2 moles

• 2.0 moles

How many moles of carbon atoms are there in 5g of carbon?

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

Find the mass in grams of 0.75 moles of magnesium (Mg).

• 32 grams
• 18 grams
• 2.21 x 10 ^23 grams

What is Avogadro's Number? (measures molecules and atoms)

• 6.02 x 10²³

• 3.145

• it changes

• 1

The molar mass is found by

• adding the masses of all the atoms in the molecule.

• dividing the total mass of all the atoms in the molecule by 6.02 x 10²³.

• multiplying the total mass of all the atoms in the molecule by 6.02 x 10²³.

• dividing the total mass of all the atoms in the molecule by the total number of atoms.

0.02 moles of potassium atoms has a mass of

• 5.11 g

• 39.098 g

• 0.782 g

• 6.022 x 10²³ g

What is the molar mass of H₂O?

• 6.02 x 10²³ grams

• 17.007 grams

• 18.015 grams

• 15.999 grams

Tags

NGSS.HS-ESS2-5