chem final 2

What is the percent by mass of oxygen in carbon dioxide?

72.71 %

The mole is 6.022 x 1023 particles.

true

The reaction: 2C2H6 + 7O2 4CO2 + 6H2O + 890.4 kJ, is

exothermic

What is the mass of 0.724 moles of carbon tetrachloride (the molar mass of CCl4 153.8 g) ?

111g

How many molecules are present in 4.00 mol of Cl2?

2.41 x 1024 molecules

When the equation NH4OH + H2SO4 (NH4)2SO4 + H2O is balanced, a term in the balanced equation is

2h2o

What is the molar mass of sodium chloride?

58.44 g

Which of the following reactants would you add to an aqueous solution of silver nitrate in order to precipitate quantitatively all the silver?

NaCl

The following reaction: 2FeO 2Fe + O2, is an example of

decomposition

One mole of glucose, C6H12O6, contains 24 atoms.

false

The following reaction: Mg + FeO example of

single displacement

The products of an acid plus a base are a salt and water.

true

Which shows a balanced chemical equation for the complete combustion of methane (CH4) gas?

CH4 + 2O2 CO2 + 2H2O

What is the molecular formula of a compound with the empirical formula CH2Cl and molar mass of 98.96 g?

C2H4Cl2

What is the empirical formula of a compound that consists of 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen?

ch2o