A compound is known to contain 40.45% carbon and 35.90% oxygen bymass. Each mole

Question

A compound is known to contain 40.45% carbon and 35.90% oxygen bymass. Each molecule contains two atoms of oxygen. the molarmass is 89.079 g/mol

Question: How many carbons are there in the molecular formula forthis compound?
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A certain copper ore contains 2.98% of Cu2S by mass, andthe remainder of the ore contains no copper. In 1991, a singleopen-air smelt furnace heated 32000 tons of this ore. Compute themaximum mass of copper metal that could have been obtained by thisprocess. Enter in ton.

Explanation / Answer

Q1) So the molar mass is 89.079g/mol means 1 mole compound weight is89.079g Now % of Carbon is 40.45% (means 100g of the compound has 40.45g ofC) We need to calculate the mass of C in one mole of the compound So the weight(mass) of C in 1 mole of the compound is                                                     = (40.45*89.079)/100 = 36.03g And the atomic mass of C is 12.01g In the compound you have 36.03g of C So, the no.of C's in the compound is 36.03/12.01=3 So the compound has 3 carbon atoms. So, there are 3 C in its molecularformula. Q2) The ore contains 2.98% of Cu2S that means 100tonsof ore has 2.98tons of Cu2S. How much Cu2S is there in 32000tons of ore                   = (2.98*32000)/100 = 953.6tons ofCu2S. But each Cu2S has 2 Cu that means 1mole ofCu2S has 2 moles of Cu. So, 953.6tons of Cu2S has (2*953.6)tons of Copper So the maximum weight of copper produced is = 1907.2tons Note:: If this heat process ideal(no loss of Cu) then only we willhave 1907.2tons of Cu. But in real world this is not possible.Thats why he said max. weight. Due to some factors we may get lessamount of Cu. But for ideal case we will get the above.

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