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+ 6. How many moles of CsHız are contained in 3.10 x 10 molecules? 7. What is the mass in grams of 6.56 x 10^2 molecules of
Name Date Molar Mass, Molar Ratio, A- 8. How many stoms of carbon are in a sample of acetone (C,H,O) that has 3.00 mol of hyd
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Answer #1

6).

C2H12 molecular weight = 72.1

given molecules

number of moles = number of molecules / avogadro Number

n = 3.10 x 1020 / 6.022 x 1023

= 0.514 x 10-3 = 0.000514 moles

7).

number of moles of ascorbic acid = number of molecules ascorbic acid / avogadro Number

n = 6.56 x 1022 / 6.022 x 1023

n = 0.108 moles

moles of  ascorbic acid = weight of ascorbic acid / molecular weight of ascorbic acid

weight of ascorbic acid = moles x molecular weight = 0.108 x 176.12 = 19.03 g

8).

In one mole of acetone 3 moles of carbon and 6 moles of Hydrogen ispresent

if 3 mole hydrogen is present 1.5 moles of carban present in the acetone

number of atoms = number of mole x avogadro number

= 1.5 x 6.022x1023

= 9.033 x1023 number of carbon atoms present.

9)

C2H6O

density = mass / volume ----> mass = density x volume

given ethanol v = 10 ml , d = 0.789

m = 7.89 g.

molecular weight of ethanol 46.07

number of moles of ethanol = 7.89/46.07

n= 0.171 moles

in one mole of ethanol six moles of hydrogen present

on 0.171 moles of ethanol 1.026 moles of hydrogen present

number of atoms of Hydrogen = moles x avogedro number

= 1.026 x 6.022x1023

= 6.18 x 1023 atoms of Hydrogens present

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