Question

Q.1. Mass of 3.01 x 10 power 20 molecule of
H20 is .......
55.18 g
O 54.18 g
O 45.1869
O 59.163g​

Answer 1

Answer:

sorry don't know

Answer 2

Answer:

mass of H20= 9*10^-3

Explanation:

Concept- Formula used for this is as follows -

Number of molecules=

number of moles x Avogadro number

N=n x A

Where, N= Number of molecules

n= number of moles

A= avogadro number

Number of moles= Mass of substance/ molar mass

Given- Number of molecules of H2O= 3.01x10^20

Molar mass of water= 18

Find - Mass of the H20 molecules

Step by step explanation -

Number of molecules=

number of moles x Avogadro number

3.01x10^20= n x 6.02*10^23

n = 3.01x10^20/6.02*10^23

n=0.5x10^-3

number of moles= 0.5x10^-3

number of moles-Mass of substance/ molar mass

0.5*10^-3= mass of H20/18

mass of H20= 0.5*10^-3*18

mass of H20= 9*10^-3

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