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# Massachusetts Comprehensive Assessment System

## 2012, High School Chemistry

 Question 45: Open-Response Reporting Category: Bonding and ReactionsStandard: 5.3 - Use the mole concept to determine the number of particles and the molar mass of elements and compounds. Glucose (C6H12O6) is formed in plants by the process of photosynthesis. The net equation for photosynthesis is shown below.Calculate the molar mass of glucose. Show your calculations and include units in your answer.Explain how the amount of carbon dioxide consumed by a plant can be determined from measuring the amount of oxygen released by the plant. Assume excess water is available.Calculate the amount of glucose, in grams, formed when 100 mol of O2 is released. Show your calculations and include units in your answer.

### Scoring Guide and Sample Student WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of the mole concept and determining the molar mass of compounds. The response correctly calculates the molar mass of glucose and clearly explains how the amount of carbon dioxide consumed by the plant can be determined by measuring the amount of oxygen released by the plant. The response also correctly calculates the amount of glucose produced when a given amount of oxygen is released.
4
3 The response demonstrates a general understanding of the mole concept and determining the molar mass of compounds.
2 The response demonstrates a limited understanding of the mole concept and determining the molar mass of compounds.
1 The response demonstrates a minimal understanding of the mole concept and determining the molar mass of compounds.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

Question 11:
Question 23:
Question 33:
Question 44:
Question 45: