Mole Concept

What is the mass of 6.02 x 10²³ platinum atoms? Round to the nearest hundredths place.

• 30.97 g

• 106.42 g

• 140.91 g

• 195.08 g

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

Which of the following statements regarding the mole is incorrect?

• A mole is a counting unit equal to 6.02 x 1023 particles.

• The number of particles in a mole is known as Avogadro’s number.

• A mole of particles of an element is numerically equal to the atomic mass of the element.

• none of the above

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

What is the percent composition of hydrogen in water?

• 89.8%

• 11.2%

• 66.7%

• 33.3%

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

Methyl acetate, is a solvent commonly used in paints, ink, and adhesives, and is often identified by the formula CH₃COOCH₃. What is the empirical formula for methyl acetate?

• CH₂O

• C₆H₁₂O₆

• C₃H₆O₂

• C_1.5H₃O

Ammonium nitrate, commonly known as ANFO, is a compound used to make explosive devices. How many grams are in one mole of ammonium nitrate to the nearest thousandths place?

• 31.014 g

• 45.021 g

• 48.045 g

• 80.043 g