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PIMSO 2022 - Science - Grade 8 - National Round Question 10

PIMSO Science · PIMSO 2022 - Science - Grade 8 - National Round

Question 10

Biofuels are sources of energy from renewable sources. One example is bioethanol, which is ethanol (C2H6O) sourced from fermentation of plant products. In one experiment, 1.00 g of liquid ethanol was found to burn with 2.08 g of gaseous oxygen. Like most hydrocarbons, this combustion process produces water (H2O) and gaseous carbon dioxide. The experimental setup allowed a student to recover 100 % of the water produced from this reaction but not all of the gaseous carbon dioxide. What would be the total weight of products the student can expect from his experiment?

Editorial review: distinguish products formed from products recovered, preserving the duplicated choices.

Original choices:
A. Less than 2.08 g
B. Exactly 3.08 g
C. Less than 3.08 g
D. Exactly 3.08 g
E. Cannot be determined from the given information