Chemistry Reaction Balancing and Stoichiometry

These flashcards cover key concepts regarding reaction balancing, reaction types, and stoichiometry including empirical and molecular formulas.

What are the coefficients when balancing O2 + NO → NO2?

1, 2, 2

What coefficients balance Na + H2O → NaOH + H2?

2, 2, 2, 1

What are the coefficients when balancing CH4 + O2 → CO2 + H2O?

1, 2, 1, 2

What are the coefficients for Fe + O2 → Fe2O3?

4, 3, 2

What characterizes a decomposition reaction?

A reaction where one compound breaks down into two or more simpler substances.

What is an example of a combustion reaction?

CH3OH + O2 → CO2 + H2O

What is the balanced equation for the combustion of propane?

C3H8 + 5O2 → 3CO2 + 4H2O

What type of reaction is C3H8 + 5O2 → 3CO2 + 4H2O?

Combustion

What is the formula weight of NaCl?

58.5 amu

What is the formula weight of sulfuric acid?

98.1 amu

What is the percentage by mass of carbon in C12H22O11?

42.1% C

How many atoms of carbon are in 12.0 g of 12C?

6.02 x 10^23 atoms

How many atoms of carbon are in 1.00 mole of C2H2?

4 atoms

How many hydrogen atoms are in 0.350 mol of C6H12O6?

2.53 x 10^24 H atoms

What is the molar mass of calcium nitrate?

164.1 g/mol

Calculate the mass in grams of 0.433 mol of calcium nitrate.

71.1 g

How many nitrate ions are in 4.20 g of HNO3?

Determined by the number of moles of HNO3 formed.

What is the mass in grams of 5.76x10^-3 mol of CdS?

0.832 g

How many oxygen atoms are in 4.88x10^-3 mol of Al(NO3)3?

2.64 x 10^22 atoms of O

How many moles of ammonium ions are in 8.776 g of ammonium carbonate?

0.1826 mol NH4+

Determine the empirical formula for a compound containing 0.104 mol K, 0.052 mol C, and 0.156 mol O.

K2CO2

Determine the empirical formula for a compound with 62.1% C, 5.21% H, 12.1% N, and 20.7% O.

C12H12N2O3

What is the empirical formula of methyl benzoate with 3.758 g C, 0.316 g H, and 1.251 g O?

C9H10O

What is the empirical formula derived from a combustion of a 0.225g sample producing CO2 and H2O?

C3H6O

If the molar mass is 116 g/mol, what is the molecular formula?

C12H12O.

What is the empirical formula for nicotine combusted to form CO2 and H2O?

C2H2N.

How many moles of CO2 are produced from 0.400 moles of glucose?

0.800 mol CO2.

How many grams of glucose are needed to form 7.50 g of ethanol?

14.79 g of glucose.

How many grams of CO2 form when 7.50 g of ethanol is produced?

7.16 g CO2.

How many grams of O2 can be prepared from 4.50 g of KClO3?

1.77 g of O2.

What is the limiting reagent in the reaction 4NH3(g) + 5O2(g)?

O2.

How many grams of NO form from the reaction of NH3 with O2?

2.06 g of NO.

How many grams of Ag will form in the reaction Zn + 2AgNO3?

Determined based on limiting reactant.

What is the theoretical yield if starting with 150 g of Fe2O3?

105 g of Fe.

What is the percent yield if the actual yield is 87.9 g?

83.7%.