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Asked by Mohammad Last Modified
Answer To find the number of molecules of H2SO4H2SO4 present in 100 mL of a 0.02 M H2SO4H2SO4 solution, we need to first calculate the number of moles of H2SO4H2SO4 present in the solution using the given concentration.
Given:
Using the formula for molarity, M=molesvolume (in L)M=volume (in L)moles, we can rearrange it to find the number of moles:
moles=M×volume (in L)moles=M×volume (in L)
moles=0.02 mol/L×0.1 Lmoles=0.02mol/L×0.1L
moles=0.002 molmoles=0.002mol
Now, to find the number of molecules, we'll use Avogadro's number, 6.022×10236.022×1023 molecules/mol:
Number of molecules=moles×Avogadro’s numberNumber of molecules=moles×Avogadro’s number
Number of molecules=0.002 mol×6.022×1023 molecules/molNumber of molecules=0.002mol×6.022×1023molecules/mol
Number of molecules=1.2044×1021 moleculesNumber of molecules=1.2044×1021molecules
So, the correct answer is:
(a) 1.2044×10211.2044×1021 molecules
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