What is the difference between a molecular formula, structural formula and an electron dot formula? Give an example of each.
1 answer:
Explanation:
Molecular formula
Molecular formula is used to represent exact no. of different atoms present in a molecule. For example, molecular formula of glucose is . That means one molecule of glucose has 6 molecules of C, 12 molecules of hydrogen and 6 molecules of oxyhen.
Structural formula
Graphic structure of a compound is represented by a structural formula. Bonding present between atoms are also shown. Structural formula of ethyl alcohol is shown in the attachment
Electron dot formula
Electron dot structure are used to represent possible structure of the compound along with bonding electrons and lone pair electrons. It is also known as Lewis dot structure. Electron dot structure of methane is shown in the attachment.
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Answer:
Water
Explanation:
To solve this problem, we need to solve for the number of molecules of these compounds;
given:
Mass of water = 1.25g
Mass of C₂H₅OH = 0.89g
We first solve for the number of moles of these compounds;
Number of moles =
Molar mass of H₂O = (2x1) + 16 = 18g/mole
Molar mass of C₂H₅OH = (12 x 2) + (1 x 5) + 16 + 1 = 46g/mole
Number of moles of H₂O = = 0.07moles
Number of moles of C₂H₅OH = = 0.02moles
We see that number of moles of water is more than that of ethanol. Therefore it has more molecules because;
1 mole of substance = 6.02 x 10²³
0.02moles of ethanol = 1.2 x 10²²molecules of ethanol
0.07moles of water = 4.2 x 10²² molecules of water