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Manipal Entrance Test 2016 Chemistry Paper
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© examsnet.com
Question : 2
Total: 50
A silicon chip used in an integrated circuit of computer has a mass of
5.68
mg
. The number of Si atoms present in this chip are
144
×
10
10
atoms
18
×
10
20
atoms
21
×
10
20
atoms
None of these
Validate
Solution:
Molar mass of silicon = 28 g = 28000 mg
∵
28000
mg
of silicon contain
6.022
×
10
23
atoms
∴ 5.68 mg of silicon contain
6.022
×
10
23
28000
×
5.68
=
0.00122
×
10
23
=
1.22
×
10
20
atoms
© examsnet.com
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