Answer:
7.7%
Explanation:
the balanced equation for the neutralization reaction is:
CH3COOH+NaOH→CH3COONa+H2O
from the balanced equation above,the mole ratio of CH3COOH to NaOH is 1:1
no of mole of CH3COOH= no of mole of NaOH
no of mole of NaOH= concentration(M) × Volume(L)
=0.2 M× 0.02556=0.005112 mol
since, no of mole of CH3COOH= no of mole of NaOH
no of mole of CH3COOH=0.005112 mol
However ,no of mole =mass/molar mass
molar mass of CH3COOH=60.052g/mol
mass of CH3COOH=0.005112×60.052
=0.307g
percentage by mass of acetic acid in the vinegar=0.307/4
=0.07675×100%
=7.675%
I think is B sorry if I’m wrong
Answer:
4 means there are four molecules of Na₂SO₃.
Explanation:
Molecule:
A molecule is the smaller particle which can exist independently.
It may be monoatomic , diatomic, triatomic etc.
For example,
Hydrogen molecule consist of two atoms H₂
Nitrogen molecule = N₂
It may be combination of atoms of different elements.
HCl, H₂SO₄,Na₂SO₃
HCl = 1 mole of hydrochloric acid or one molecules of hydrochloric acid
H₂SO₄= 1 mole of sulfuric acid or one molecule of sulfuric acid
Na₂SO₃ = 1 mole of sodium sulfite or one molecule of sodium sulfite.
4Na₂SO₃ = 4 mole of sodium sulfite or four molecule of sodium sulfite.
The coefficient before the formula indicate the total number of molecules.
Sorry if I'm wrong but it's 1) learner engages in scientifically oriented questions. 2) learner gives priority to evidence in responding to questions. 3) learners formulate explanations from evidence. 4) learner connects explanations to scientific knowledge. 5) learner communicates explanations.
