Stoichiometry: Oxygen and Empirical Formula
LEARNING TASK NO. 4B
Composition Stoichiometry Problems Mole Relationship from Chemical Formulas:
a) Determine the number of moles of chloride ions in 2.53 mol ZnCl2.
b) Calculate the number of moles of each element in 1.25 mol glucose (C6H12O6).
c) How many molecules of oxygen atoms are present in 5.00 mol diphosphorus pentoxide?
d) Calculate the number of moles of hydrogen atoms in 11.5 mol water.
e) A sample of ethanol (C2H5OH) has a mass of 45.6 g.How many carbon atoms does the sample contain?How many hydrogen atoms are present?How many oxygen atoms are present?
Percent Composition from Chemical
a) What is the percent of C & H in C2H6 ?
b) What is the percent of each element in Al2 (SO3)3 ?
Empirical Formula
a) What is the empirical formula for a compound which is 75 % C and 25 % H?
b) What is the empirical formula for a compound which has 48.64 % C, 8.16 % H, 43.20 % O
c) What is the empirical formula of 40.68 % C, 5.08 % H, and 54.24 % O?
d) A blue solid is found to contain 36.894% N and 63.16% O. What is the empirical formula for this solid?
e) What is the empirical formula for a compound that contains 10.89% Mg, 31.77% Cl, and 57.34% O?
Molecular Formula
a) Succinic acid is a substance produced by lichens. Chemical analysis indicates it is composed of 40.68% C, 5.08% H, and 54.24% O and has a molar mass of 118.1 g/mol. Determine the empirical and molecular formulas for succinic acid.
b) Analysis of a chemical used in photographic developing fluid indicates a chemical composition of 65.45% C, 5.45% H, and 29.09% O. The molar mass is found to be 110.0 g/mol. Determine the molecular formula.
c) .A colorless liquid composed of 46.68% N and 53.32% O has a molar mass of 60.01 g/mol. What is the molecular formula?
Composition Stoichiometry Problems Mole Relationship from Chemical Formulas:
a) Determine the number of moles of chloride ions in 2.53 mol ZnCl2.
b) Calculate the number of moles of each element in 1.25 mol glucose (C6H12O6).
c) How many molecules of oxygen atoms are present in 5.00 mol diphosphorus pentoxide?
d) Calculate the number of moles of hydrogen atoms in 11.5 mol water.
e) A sample of ethanol (C2H5OH) has a mass of 45.6 g.How many carbon atoms does the sample contain?How many hydrogen atoms are present?How many oxygen atoms are present?
Percent Composition from Chemical
a) What is the percent of C & H in C2H6 ?
b) What is the percent of each element in Al2 (SO3)3 ?
Empirical Formula
a) What is the empirical formula for a compound which is 75 % C and 25 % H?
b) What is the empirical formula for a compound which has 48.64 % C, 8.16 % H, 43.20 % O
c) What is the empirical formula of 40.68 % C, 5.08 % H, and 54.24 % O?
d) A blue solid is found to contain 36.894% N and 63.16% O. What is the empirical formula for this solid?
e) What is the empirical formula for a compound that contains 10.89% Mg, 31.77% Cl, and 57.34% O?
Molecular Formula
a) Succinic acid is a substance produced by lichens. Chemical analysis indicates it is composed of 40.68% C, 5.08% H, and 54.24% O and has a molar mass of 118.1 g/mol. Determine the empirical and molecular formulas for succinic acid.
b) Analysis of a chemical used in photographic developing fluid indicates a chemical composition of 65.45% C, 5.45% H, and 29.09% O. The molar mass is found to be 110.0 g/mol. Determine the molecular formula.
c) .A colorless liquid composed of 46.68% N and 53.32% O has a molar mass of 60.01 g/mol. What is the molecular formula?