Chapter 3

A compound with an empirical formula of C2H3Br2 has a molar mass of 373.69 g/mol. What is the molecular formula

C4H6Br4

An unknown compound with a molar mass of 223.94 g/mol consists of 32.18% C, 4.50% H, and 63.32% Cl. Find the molecular formula for the compound

C6H10Cl4

There are two stable isotopes of chlorine: Chlorine-35, with a mass of 34.968853 amu; and chlorine 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu

Chlorine contains more 35/17 Cl than 37/17 Cl

MnO2 + 4HCl -> MnCl2 + 2H20 + Cl2 According to the reaction, determine the limiting reactant when 5.6 moles of Mn)2 are reacted with 7.5 moles of HCl

HCl

How many molecules are there in 8.0g of ozone, O3

1.0x1023 molecules

How many grams of nitrogen are there in 7.5 g of Ca(NO3)2

1.3g

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles of calcium based on the following chemical reaction? V2O5 + 5Ca -> 2V + 5CaO

1.6 mol

Calculate the average atomic mass of silver

107.87 amu

Calculate the molecular mass of menthol C10H20O

156.26 amu

Ammonia is reacted with sulfuric acid to form ammonium sulfate. Write the balanced reaction

2NH3 + H2SO4 -> (NH4)2SO4

Balance the following chemical equation NaNO3 -> NaNO2 + O2

2NaNO3 -> 2NaNO2 +O2

Calculate the molar mass , in g/mol, of Al2(SO4)3

342.17 g/mol

What is the mass of 0.55 mole of C6H6

42.96 g

Which of the following NH3 samples contains the greatest number of moles of NH3

a) 6.78x10 g Nh3 b)8.90g NH3 c) 0.356 moles NH3 d)4.65x1023 NH3 molecules e)6.78x1022 NH3 molecules

The reaction of 44.1g of CrO3 with 35.0g of Al produced 25.6g of Cr. What is the percent yield for this reaction? 2Al + Cr2O3 -> Al2O3 + 2Cr

84.9%