# Answer to Question #11960 in Inorganic Chemistry for leah

Question #11960
calculate the mass of each of the following 1) 1.95x 10^22 molecules of sucrose, C12 H22 O11 2) 0.780 mol Ca(CN)2 3) 9.57 X 10^17 atoms platinum
1
2012-07-17T12:07:57-0400
1) The sucrose molar mas is 342.3 g/mol. Amount of sucrose is
n(C12 H22 O11)
= 1.95E22 / 6.022E23 = 0.032 mol
The mass of sucrose is
m(C12 H22 O11) =
n(C12 H22 O11) * M(C12 H22 O11) = 0.032 mol * 342.3 g/mol = 10.95 g

2)
The molar mass of Ca(CN)2 is 92.1 g/mol.
The mass of Ca(CN)2
is
m(Ca(CN)2) = n(Ca(CN)2) * M(Ca(CN)2) = 0.78 mol * 92.1 g/mol = 71.84
g

3) The platinum molar mas is 195 g/mol. Amount of platinum is
n(Pt)
= 9.57E17 / 6.022E23 = 1.6E-6 mol = 0.0000016 mol
The mass of platinum
is
m(Pt) = n(Pt) * M(Pt) = 1.6E-6 mol mol * 195 g/mol = 0.0003 g = 0.3 mg

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Assignment Expert
24.07.12, 19:19

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Leah
24.07.12, 19:08

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You need to prepare 2.50L of a 0.125M solution of hydrochloric acid, but the only solution available is 12.0M what volume of the 12.0M solution must be diluted?

Leah
24.07.12, 19:01

calculate the number of moles in each of the following
1.) 12.6g water
2.) 12.6g sodium chloride
3.) 4.57 x 10^17 atoms platinum

Determine the number of atoms in each of the following

1.) 2.85 mol of ag
2.) 12.9g of Fe (NO3)3
3.) 12.9g of CaCO3

a)What volume of 0.125M CaCl2 can be made from 15.0g?

b)Determine the volume of 4.50M silver nitrate that can be made from 100.0g of silver nitrate

c) What is the volume of a 0.875 mol/L solution that contains 18.6g of ferrous sulfate heptahydrate?