stoichiometry

Unit 6 Lesson 3 Activity: Stoichiometry

CHEMISTRY

Stoichiometry can be thought of as the math of chemistry. It involves using relationships between reactants and/or products to determine such quantities as mass, moles, and number of atoms. Dimensional analysis is a way to simplify stoichiometric problem solving. In this activity, you will use dimensional analysis in order to count the number of atoms in a given substance.

1.  A sample of gold (Au) has a mass of 35.12 g.                            molar mass

a.   Calculate the number of moles of gold (Au) in the sample and record in Table 1. Show your work below.

b.   Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work below.

2.  A sample of table sugar (sucrose, C₁₂H₂₂O₁₁) has a mass of 1.202 g.

a.   Calculate the number of moles of C₁₂H₂₂O₁₁ contained in the sample and record in Table 1. Show your work. (Start with molar mass from periodic table and multiply by number of atoms of each element.)

a.    Find molar mass of Carbon. .         1.202 g (1mol sucrose)/(342g)=3.5 x 10^-3 mol surcose

Find molar mass of Hydrogen.

Find molar mass of Oxygen.

Then, add all 3 totals to find total molar mass of C₁₂H₂₂O₁₁.

Then calculate moles of C₁₂H₂₂O_11.

b.   Calculate the moles of each element in C₁₂H₂₂O₁₁ and record in Table 1. Show your work. Take the moles of C₁₂H₂₂O₁₁ and multiply by the number of atoms of each element in the compound.

c.    Calculate the number of atoms of each type in C₁₂H₂₂O₁₁ record in Table 1. Show your work. Take the moles of each element above and multiply by 6.02 x 10²³ to find the number of atoms of each element in the compound. Make sure your answers are correctly written in scientific notation (In scientific notation all numbers are expressed as a product of a number that is > 1 but < 10  and an exponent of 10.)

RUBRIC

Total points: ___ /20

Comments :

Name:                                                                            Date:

Unit 6 Lesson 3 Activity: Stoichiometry

CHEMISTRY

Stoichiometry can be thought of as the math of chemistry. It involves using relationships between reactants and/or products to determine such quantities as mass, moles, and number of atoms. Dimensional analysis is a way to simplify stoichiometric problem solving. In this activity, you will use dimensional analysis in order to count the number of atoms in a given substance.

1.  A sample of gold (Au) has a mass of 35.12 g.                            molar mass

a.   Calculate the number of moles of gold (Au) in the sample and record in Table 1. Show your work below.

b.   Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work below.

2.  A sample of table sugar (sucrose, C₁₂H₂₂O₁₁) has a mass of 1.202 g.

a.   Calculate the number of moles of C₁₂H₂₂O₁₁ contained in the sample and record in Table 1. Show your work. (Start with molar mass from periodic table and multiply by number of atoms of each element.)

a.    Find molar mass of Carbon. .         1.202 g (1mol sucrose)/(342g)=3.5 x 10^-3 mol surcose

Find molar mass of Hydrogen.

Find molar mass of Oxygen.

Then, add all 3 totals to find total molar mass of C₁₂H₂₂O₁₁.

Then calculate moles of C₁₂H₂₂O_11.

b.   Calculate the moles of each element in C₁₂H₂₂O₁₁ and record in Table 1. Show your work. Take the moles of C₁₂H₂₂O₁₁ and multiply by the number of atoms of each element in the compound.

c.    Calculate the number of atoms of each type in C₁₂H₂₂O₁₁ record in Table 1. Show your work. Take the moles of each element above and multiply by 6.02 x 10²³ to find the number of atoms of each element in the compound. Make sure your answers are correctly written in scientific notation (In scientific notation all numbers are expressed as a product of a number that is > 1 but < 10  and an exponent of 10.)

RUBRIC

Total points: ___ /20

Comments :