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# Which of the following temperatures and pressures are used as standards for gases?

Which of the following temperatures and pressures are used as standards for gases?

(Points: 3)

25°C, 1 atm

0°C, 1 atm

10°C, 1 atm

5°C, 2 atm

Which of the following is not a measure of the amount of matter?

(Points: 3)

STP

mole

molar mass

molar volume

. Which of the following is equal to the number of particles in 36 grams of carbon-12?

(Points: 3)

3 : 1 mole ratio

3 : 1 molar mass

1 : 3 molar volume

3 moles

Which of the following substances has a molar mass of 133.3 g?

(Points: 3)

P2O5

BaCl2

AlCl3

MgCl2

Amedeo Avogadro discovered which of the following?

(Points: 3)

One mole of a substance contains 6.02 × 1023 particles.

Equal volumes of gases at STP contain 6.02 × 1023 particles.

The mass of one mole of a substance is equal to its formula weight expressed in grams.

Equal volumes of gases at the same temperature and pressure contain the same number of particles.

What is the volume of 1.5 moles of gas at STP?

(Points: 3)

9.02 L

20.0 L

33.6 L

22.4 L

You do an experiment in which you need 1.5 moles of tyrosine (C9H11NO3). How many grams must you weigh out?

(Points: 3)

65 g

113 g

181 g

272 g

For an experiment, you need to dissolve 0.14 moles of NaCl in 1 liter of water. How much NaCl must you weigh out?

(Points: 3)

8.2 g

5.9 g

3.2 g

0.14 g