mole concept

A student needs 65.0 g of copper(II) chloride for an experiment. How many atoms of copper is this?

• 2.91 x 10^23 atoms

• 3.91 x 10^25 atoms

• 2.35 x 10^23 atoms

• 4.70 x 10^23 atoms

Tags

NGSS.HS-PS1-7

If one Monster energy drink contains 0.16 g of caffeine, how many moles of caffeine do we consume when we drink 1 can? The chemical formula for caffeine is C₈H₁₀N₄O₂.

• 194.19 moles

• 1.07 moles

• 0.00082 moles

• 1213.69 moles

Tags

NGSS.HS-PS1-7

Mylanta, a common antacid, contains magnesium hydroxide, Mg(OH)₂. How many moles of magnesium hydroxide are in 75.0 g of magnesium hydroxide?

• 0.551 moles

• 0.778 moles

• 1.29 moles

• 1.82 moles

Tags

NGSS.HS-PS1-7

Acetone, C₃H₆O, is the main component of fingernail polish remover. What is the molar mass of acetone to the nearest hundredths place?

• 29.018 g/mol

• 34.058 g/mol

• 58.1 g/mol

• 58.08 g/mol

Which of the following compounds is correctly matched with its empirical formula?

• Dihydrogen dioxide - H₂O₂

• Hydrogen dioxide - H2O

• Tetrahydrogen dioxide - H4O2

• Dihydrogen dioxide - HO

Tags

NGSS.MS-PS1-1

Chalk is mostly made of calcium carbonate, CaCO₃. If it took 48.6 g of chalk to write your name on the sidewalk, how many moles of calcium carbonate does your name contain?

• 0.486 mol

• 0.714 mol

• 1.40 mol

• 2.06 mol

Tags

NGSS.HS-PS1-7

A scientists analyzed an unknown sample and determined that it contained 5 moles of oxygen and 2 moles of nitrogen? Which of the following would be its molecular formula?

• N2O5

• N4O

• NO

• O2N5

What is the molar mass of carbon?

• 6.0 g/mol
• 12.0 g/mol
• 22.4 g/mol
• 6.02 x 10²³ g/mol

What is the molar mass of CO₂?

• 22.0 g/mol
• 28.0 g/mol
• 44.0 g/mol
• 56.0 g/mol

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules