help 27h How many sulfur dioxide nolecules are there in 1 80 mol of sult A) 1 08

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27h How many sulfur dioxide nolecules are there in 1 80 mol of sult A) 1 08 1023 B)6.02 1024 C) L.0s 1034 D) 1.80 1024 E) 6.021023 28) Barium reacts with a polysiomic ion so 5oem a compuzed with the general to would be the most likelty fornala foe the compound f B Nax onmed between sodium and the polyatomic Ei NazX2 ien X A) Nax2 C) NagX D) NazX 29e what is the mass % of carbon in dimethyl sulfo ide C2H6S) rounded to thres significant igures? A) 78.1 B) 25.4 C) 28 6 D) 7.74 E) 30.7 30) How many grams of hydrogen are in 46 g of CH40 A) 5.8 8)15 C)0.36 Di 180 E)2.8 31) what is te empirical fornula of a compound that is 66.6% C. 11.2% H, and 2229, O by mass? B) C4lgo C)CoHOp DICGHI1O E) Caho 32) There are , mol of carbon atoms in 4 mol orc4H802 A) 32 B) 16 C) 4 D) 20 33) Which of the followiag statements is TRUE? A) 63.55 g of copper contains Sewer atoms than in 26 98 g of aluminum B) 63.55 g of copper comains more atoms than in 2698 g of aluminum C)63.55 g of copper and 26.98 g of alumimum contain equal number of os DI 1 mole of copper weigdis the same as I molt of sluminsum E) I molecule of copper weighs 63.55 g

Explanation / Answer

27)

number of molecule of SO2 = number of mol * Avogadro’s number

= 1.80 mol * 6.022*10^23 molecules/mol

= 1.08*10^24 molecule

Answer: C

28)

The compound is Ba3X2

Ba forms Ba2+ ion

So,

anion must be X3- ion

Na forms Na+ ion

Na+ and X3- forms Na3X

Answer: D

29)

Molar mass of C2H6SO,

MM = 2*MM(C) + 6*MM(H) + 1*MM(S) + 1*MM(O)

= 2*12.01 + 6*1.008 + 1*32.07 + 1*16.0

= 78.138 g/mol

MM of C2H6SO = 78.138

Lets calculate the mass of element

mass of C = 2*MM(C)

= 24.02 g

Mass % of C = (24.02*100)/78.138

= 30.7 %

Answer: 30.7 %

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