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Stoichiometry Practice - Empirical, Molecular Formula - Chemistry 1 |, Assignments of Chemistry

Copiah-Lincoln Community CollegeChemistry

Material Type: Assignment; Class: Chemistry 1 - Introduction; Subject: Chemistry; University: Copiah-Lincoln Community College; Term: Forever 1989;

Typology: Assignments

Pre 2010

Uploaded on 12/12/2009

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Stoichiometry Practice – 3
Empirical & Molecular Formula/Reaction Stoichiometry
1. A compound is found to contain 43.2 % copper, 24.1 % chlorine, and 32.7% oxygen by
mass. Determine its empirical formula and name the compound.
2. Ribose is an important sugar (part of RNA), with a molar mass of 150.15 g. If its
empirical formula is CH2O, what is its molecular formula?
3. Naphthalene is a soft covalent solid that is often used in mothballs. Its molar mass is
128.18 g. It contains 93.75% carbon and 6.25% hydrogen. Determine the molecular
formula of naphthalene from this data.
4. A compound of molecular mass 56.108 g has the following composition: Carbon
85.63% and hydrogen 14.37%. What is its molecular formula?
5)Methanol (CH3OH) is an important industrial compound that is produced from the
following reaction: CO + H2 CH3OH. What mass of carbon monoxide would be
needed to produce 1,000 g of methanol?
pf2

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Stoichiometry Practice – 3 Empirical & Molecular Formula/Reaction Stoichiometry

  1. A compound is found to contain 43.2 % copper, 24.1 % chlorine, and 32.7% oxygen by mass. Determine its empirical formula and name the compound.
  2. Ribose is an important sugar (part of RNA), with a molar mass of 150.15 g. If its empirical formula is CH 2 O, what is its molecular formula?
  3. Naphthalene is a soft covalent solid that is often used in mothballs. Its molar mass is 128.18 g. It contains 93.75% carbon and 6.25% hydrogen. Determine the molecular formula of naphthalene from this data.
  4. A compound of molecular mass 56.108 g has the following composition: Carbon 85.63% and hydrogen 14.37%. What is its molecular formula? 5)Methanol (CH 3 OH) is an important industrial compound that is produced from the following reaction: CO + H 2  CH 3 OH. What mass of carbon monoxide would be needed to produce 1,000 g of methanol?

6)Iron is generally produced from iron ore through the following reaction in a blast furnace: Fe 2 O 3 + CO  Fe + CO 2. If 4,000 g of Fe 2 O 3 are available to react, how many moles of CO are needed? 7)Given the following reaction: Na 2 S + AgNO 3  Ag 2 S + NaNO 3 , how many grams of Ag 2 S can be generated from the reaction of 3.94 g of AgNO 3?

  1. How many grams of sodium hydroxide are required to form 51.63 g of lead hydroxide? Pb(NO 3 ) 2 + NaOH  Pb(OH) 2 + NaNO 3 9)How many grams of potassium iodide are necessary to completely react with 20.61 g of mercury (II) chloride? HgCl 2 + KI  HgI 2 + KCl 10)How many grams of oxygen are necessary to completely react with 22.8 grams of methane, CH 4 , in a combustion reaction?