Do Now - AP - Molar Mass

What is the molar mass of H₂O with the sig figs from the periodic table?

• 18.0 g/mole

• 33.008 g/mole

• 17.008 g/mole

• 18.016 g/mole

• 33.01 g/mole

To make a solution, it requires you to use 180 mL of water. The density of water is 1.00 g/mL, how many moles of water are being used to make this solution?

• 10. mole

• 180 mole

• 324 mole

• 320 mole

The molar mass of compound, XY, is 140.1 g/mole. If you want to react 0.010 moles of compound XY, how many grams should you measure?

A.

• 1.4 g

• 1,401 g

• 7.0 x 10^-5 g

• 7.0 x 10^-4 g

Avogadro's number (6.022 x 10²³) is the measurement of the number of particles that are in a mole. Which of the following ARE true about moles/grams/particles?

• 1.008 g of Hydrogen is 6.022 x 10^23 atoms of hydrogen

• You will always need to measure at least one moles of substance to do a chemical reaction

• 1.0 g of Oxygen is 6.022 x 10^23 atoms of Oxygen

• We measure the mass of a substance in a lab but we predict reactions based upon moles

• We measure the moles of a substance in a lab but we predict reactions based upon mass

If you have three different polyatomic oxides, which polyatomic oxide will have a 77.4% of its molar mass come from oxygen?

• NO₃

• SO₄

• CO₃

• All of them

If you had 1.0 g of each of the following elements; which would have the most number of moles- Aluminum (26.98 g/mole, Silicon (28.09 g/mole), or Phosphorus (30.97 g/mole)

• Al

• Si

• P

Tags

NGSS.HS-PS1-7

If you had 1.0 g of all three substances (NO3, SO4, CO3), which would contain the most oxygen atoms?

• NO₃

• SO₄

• CO₃

• All of them