Unit 6 Test Review Chemistry

How many particles are in a mole? 2 moles? 3 moles?

1 mole= 6.022 x 10^23 2 moles= 1.204 x 10^23 3 moles= 1.806 x 10^23

Consider the following reaction: H2+Cl2 = 2HCl How many liters of HCl are produced when 56 L of chlorine are reacted with excess hydrogen? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

112 L HCl

If a sample of nitrogen gas (N2) contains 3.0 x 10^24 atoms of nitrogen, then about how many moles of nitrogen gas are in the sample?

2.5 moles

Calcium nitrate tetrahydrate [Ca(NO3)2 x 4H2O] is a chemical used in explosives. What is its formula mass? Be sure to add the water of hydration, which is the 4H2O part (water surrounding the calcium nitrate).

236.092 g/mol

When aluminum oxidizes in air, it forms aluminum oxide (Al2O3) : 4Al+3O2 = 2Al2O3 If a 51 g sheet of aluminum oxide formed completely in excess oxygen, how many grams of aluminum were oxidized?

27 g of Aluminum Oxide

If 2 molecules of one reactant combine with 5 molecules of another to produce 3 molecules of a product, then which of the following is the correct representation of the reaction? 2A + 3B = 5C 2A + 5B = 3C

2A + 5B = 3C

In a spacecraft, the following reaction occurs: CO2(g)+2LiOH(s) = LiCO3(s)+H2O(I) How many liters of carbon dioxide will 3 moles of lithium hydroxide (LiOH) absorb? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

34 L

What is the formula mass (molar mass) of sucrose (C12H22O11), table sugar?

342g

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6+7O2 = 4CO2+6H2O How many liters of carbon dioxide will be produced when 179 L of ethane are burned? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

358.4 L CO2

What is the formula mass (molar mass) of cholesterol (C27H46O), a fat found in your blood and cell membranes?

386g

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6+7O2 = 4CO2+6H2O How many moles of water will be produced when 16 moles of ethane are burned?

48 moles

If a sample of (N2) contains 6.0 x 10^24 atoms of nitrogen, then about how many moles of nitrogen gas are in the sample?

5 moles

A chemical reaction yields 3 moles of lithium hydroxide (LiOH). How many grams of lithium hydroxide are present?

72 g

Look at the following hypothetical reaction: A+3B = C+3D. Assume that the equation is balanced. Which of the following mole ratios will produce the most product? A/B A/3B 3A/B 2A/B

A/3B

Look at the following hypothetical reaction: A+4B = C + 3D. Assume that the equation is balanced. Which of the following mole ratios will produce the most product? A/B 3A/4B A/4B 4A/B

A/4B

Look at the following hypothetical reaction A+3B=C+3D: . Assume that the equation is balanced. In which of the following reactant mole ratios will reactant B be the limiting reagent? A/B A/5B A/4B 2A/7B

A/B

Which of the following compounds does not form a precipitate when reacted with sodium hydroxide? Cu(NO3)2 Fe(NO3)3 NaNO3 FeSO4

NaNO3

Which of the following statements is true about 22.4 L each of hydrogen, ammonia, and uranium dioxide gas if the temperature and pressure are the same for all the gases? -Uranium dioxide gas has the most number of molecules -Oxygen gas the most number of molecules -Hydrogen gas has the least number of molecules -The gases have the same number of molecules

the gases have the same number of molecules