Jay K.

asked • 09/14/23

Chemistry: According to the following reaction, how many grams of oxygen gas are required for the complete reaction of 25.5 grams of carbon (graphite)?

carbon (graphite) (s) + oxygen (g) —-> carbon dioxide (g)


Mass= grams oxygen gas

Holly A.

tutor
First you will need to rewrite the equation with the correct formulas for each reactant and product. Then you need to balance the equation. You will also need to find the molar mass for the reactants envolved. Remember Oxygen is a diatomic. So the formula should be O2. Part 2… is setting up the dimensional analysis problem and solving. Start with grams of given in the problem… use molar mass to convert to moles of given reactant… use mole to mole ratio to convert to moles of unknown reactant… convert from moles of unknown reactant to grams using molar mass. Calculate then solve. Make sure you look at the given 22.5g to know how many significant figures your answer should have.
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09/15/23

1 Expert Answer

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Frank M. answered • 09/16/23

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balanced equation: C + O2----> CO2

1). Convert grams of carbon to moles: (25.5 grams C)(1 mole carbon/12.01 grams)=2.12 moles C

2) From the equation, 1 mole of carbon reacts with 1 mole oxygen gas (O2), so we have 2.12 moles of O2 required.

3). Multiply by mass of 1 mole of O2, (32.0grams), (2.12 moles O2)(32.0 grams/mole)=67.8 grams oxygen.

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