The mass % will be affected by 0.25%.
What is mass percentage ?
Mass Percentage is defined as the grams of solute per gram of solution , multiplied by 100%
It is given that
She used the pipette properly but it consistently delivered 4.70 cm³ of vinegar instead of the desired 5.00 cm³.
Mass Percentage affected = ?
Mass is directly proportional to the volume
For calculating ratios of the same compound the density can be neglected
the density of vinegar is 1.05 gm/cm³
mass for 5cm³= 5*1.05 = 5.25gm
mass for 4.75 cm³ = 4.9875 gm
for 100 gm solution
mass% expected = 5.25* 100/100 = 5.25%
mass % (actual) = 4.9875 / (100-0.2625) = 5%
Therefore the mass % will be affected by 0.25%.
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