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A student has a beaker full of water. He finds that he has 4.0 x 10 molecules of H₂O in his beaker, how many grams is this?

A student has a beaker full of water. He finds that he has 4.0 x 10 molecules of H₂O in his beaker, how many grams is this?

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter3: Molecules, Moles, And Chemical Equations
Section: Chapter Questions
Problem 3.115PAE: 3.115 The average person exhales 1.0 kg of carbon dioxide in a day. Describe how you would estimate...
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5. 6.TIMPIPICT A student has a beaker full of water. He finds that he has 4.0 x 10² molecules of H₂O in his beaker, how many grams is this? BU12m014 31.10.2 70.4
Transcribed Image Text:5. 6.TIMPIPICT A student has a beaker full of water. He finds that he has 4.0 x 10² molecules of H₂O in his beaker, how many grams is this? BU12m014 31.10.2 70.4
Expert Solution
Step 1: Calculation of the moles of water

Given,

number of H2O molecules = 4.0 x 1024 molecules 

we know,

=> moles of H2O = given number of molecules / 6.022 x 1023 molecules/mol 

on substituting the value 

=> moles of H2O = 4.0 x 1024 molecules / 6.022 x 1023 molecules/mol  = 6.6423 mol

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