00 Sprint 11:02 PM c @ 28%[ session.masteringchemistry.com C Law of Consenation

Question

00 Sprint 11:02 PM c @ 28%[ session.masteringchemistry.com C Law of Consenation of Mass Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a chemical reaction must be equal to the mass of the starting materials. Formally, this concept is called the law of conservation of mass, Part A A sample of sodum reacts completely with 0.142 kg of chlorine, forming 23, of sodium chloride. What mass of sodium reacted? Express your answer to three significant figures and include the appropriate units. Hints alue Units Submit My Answers Give Up Part B When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 276of carbon were burned in the presence of 90.1of What mass of carbon dioxide was produced? or oxygen remained unreacted Express your answer to one decimal place and include the appropriate units. Hints alue Units Submit My Answers Give Up

Explanation / Answer

A.

Na + ½ Cl2 --> NaCl

Mass of chlorine reacted = 0.142 kg * 1000 g

= 142 g

Mass of NaCl formed = 234 g

By mass balance, mass of sodium reacted = Mass of NaCl formed - Mass of chlorine reacted

Mass of sodium reacted = 234 – 142 g

= 92 g

B.

C + O2 --> CO2

Mass of carbon reacted = 27.6 g

Mass of oxygen reacted = (90.1 – 16.5) g

= 73.6 g

By mass balance, mass of CO2 produced = Mass of carbon reacted + Mass of oxygen reacted

Mass of CO2 produced = 27.6 + 73.6 g

= 101.2 g

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