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How many C atoms are present in a 7.57 ng sample of nitrobenzene, C6H5NO₂? Note: 1 ng is one nanogram. Enter your answer in exponential notation, e.g. 1.23e20 for 1.23x102⁰. Do not include any units or words as part of your answer. Give your answer accurate to three significant figures. Molar masses (in g mol¯¹): H, 1.008 Number C, 12.01 N, 14.01 O, 16.00

How many C atoms are present in a 7.57 ng sample of nitrobenzene, C6H5NO₂? Note: 1 ng is one nanogram. Enter your answer in exponential notation, e.g. 1.23e20 for 1.23x102⁰. Do not include any units or words as part of your answer. Give your answer accurate to three significant figures. Molar masses (in g mol¯¹): H, 1.008 Number C, 12.01 N, 14.01 O, 16.00

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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How many C atoms are present in a 7.57 ng sample of nitrobenzene, C6H5NO₂? Note: 1 ng is one nanogram. Enter your answer in exponential notation, e.g. 1.23e20 for 1.23x102⁰. Do not include any units or words as part of your answer. Give your answer accurate to three significant figures. Molar masses (in g mol-¹): H, 1.008 Number C, 12.01 N, 14.01 O, 16.00
Transcribed Image Text:How many C atoms are present in a 7.57 ng sample of nitrobenzene, C6H5NO₂? Note: 1 ng is one nanogram. Enter your answer in exponential notation, e.g. 1.23e20 for 1.23x102⁰. Do not include any units or words as part of your answer. Give your answer accurate to three significant figures. Molar masses (in g mol-¹): H, 1.008 Number C, 12.01 N, 14.01 O, 16.00
Expert Solution
Step 1: Mole concept

 Given mass of nitrobenzene = 7.57 ng

Required no. Of C-atoms in 7.57ng of nitrobenzene = ? 

As 1ng = 10-9 g 

mass of nitrobenzene=7.57 ng=7.57 × 10-9 g

Molar mass of C6H5NO2 is equal to 

= 6(M.M. of C) + 5(M.M. of H) + 1( M.M. of N) + 2 ( M.M. of O ) 

= 6(12.01) + 5(1.008) + 1(14.01) + 2(16.00)

= 123.11 g/mol.

& 1 mole of C6H5NO2 Contains 6 moles of C.

& 1 mole of any substance contains 6.022×1023 atoms of that substance. 


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