6.06 pt 2

A substance has half the number of particles as 12 grams of carbon-12. How many moles are in the substance?

0.5

Molar mass is the molecular (formula) mass of any substance expressed in which unit?

grams

Which temperature and pressure are used as standards for gases?

0°C, 1 atm

Which example has 1.2×1024 oxygen atoms?

1 mole of peroxide (H2O2)

You have a 5-liter container with 1.30×1024 molecules of ammonia gas (NH3) . How many molecules of hydrogen gas (H2) are in an identical container at the same temperature and pressure?

1.30×1024 molecules

What is equal to the number of particles in 18 grams of carbon-12?

1.5 moles

You have 100 grams of potassium fluoride (KF) . How many moles do you have?

1.72 mol

What is the molar mass of calcium chloride dihydrate (CaCl2⋅ 2H2O) ? Be sure to include the mass of all elements in the formula including the elements in water.

147 g/mol

For an experiment, you need to dissolve 0.05 mole of NaCl in one liter of water. How much NaCl must you weigh out?

2.9 g

What is the volume of one mole of a diatomic gas at STP ?

22.4 L

What volume will 1.5 moles of oxygen gas occupy at STP ?

33.6 L

What mass will 33.6 L of nitrogen gas (N2) have at STP ?

42 g

You do an experiment in which you need 0.25 mole of tyrosine (C9H11NO3) . How many grams must you weigh out?

45.3 g

At STP , how many molecules of nitrogen gas are in 224 L?

6.022×1024

Who discovered the principle that equal volumes of gases at the same temperature and pressure contain the same number of particles?

Amedeo Avogadro

Which substance has a molar mass of 208 g?

BaCl2

In the reaction 2K + 2H2O→2KOH + H2 , which compound has an element ratio of 1:1:1 ?

KOH

In which reaction do four total molecules of reactants produce two total molecules of products?

N2+3H2→2NH3

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

STP

You have one mole of a diatomic gas. Which statement is true?

You have the same number of particles that are in 12 grams of carbon-12.