39 Household sugar, sucrose, has the molecular formula C12H22O\". What is the %

Question

39 Household sugar, sucrose, has the molecular formula C12H22O". What is the % of on in sucrose, by mass? A) 26.7% B) 33.3% C) 41.4% D) 42.1% E) 52.8% 40 Balance the following equation: BrOs(s) + HF(/)-> BF3 g) + H2O(l) B:03(s) + 6HF(/)-> 2BF3(g) + 3H20(1) A) D) B20s(s) + 3HFO 2BFs(g)+3H:00) B2O3(s) + 6HF(/) 2BF3(g) + 6H20(1) 41 Balance the following equation: CsHi8O3() + 1102(g) 9H20(g) + 8CO2() 2CsH 18O3() + 2202(g) 9H2O(g) + 16CO2(g B) D) CsHisO:()+ 1302(g)-18H2O(g) +8CO (g) E) 2CsHsO()+ 1702g)18H20(g)+16CO2(g) How many molecules are in 0.534 mol of ethanol, C2HsOH? 42. A) 1.13 x 104 molecules B) 1.48 x 1025 molecules C) 2.44 x 10 molecules D) 3.22 x 1023 molecules E) 6.98 x 1021 molecules The number of hydrogen atoms in 0.050 mol of C3HsO3 is 43 A) 3.0x 1022 H atoms B) 1.2 x 1023 H atoms C) 2.4 x 1023 H atoms D) 4.8 x 103 H atoms E) None of these choices is correct.

Explanation / Answer

Ans 39 : D) 42.1 %

The molar mass of sucrose is 342.3 g/mol

Now , in one mole of compound , there are 12 mole atoms of carbon

So the mass of carbon in one mole : 12 x 12.01 = 144.12 g

Then % of carbon by mass : (144.12 / 342.2) x 100

= 42.1 %

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