Chemistry, 21.09.2019 02:30 myg21

What is the molecular formula for a compound if it is 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen, and has a molar mass of 180.18 g/mol?

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If molar mass of compound is 180.18 g/mol and of that mass 39.99 % is Carbon
∴ molar mass of carbon in compound = 180.18 g/mol × (39.99 ÷ 100)
= 72 g/mol
since a single carbon = 12 g/mol
then number of carbons in compound = 72 ÷ 12 g/mol
= 6 CARBON atoms

If molar mass of compound is 180.18 g/mol and of that mass 6.73 % is hydrogen
∴ molar mass of hydrogen in compound = 180.18 g/mol × (6.73 ÷ 100)
≈ 12 g/mol
since a single hydrogen = 1 g/mol
then number of hydrogen in compound = 12 ÷ 1 g/mol
= 12 HYDROGEN atoms

If molar mass of compound is 180.18 g/mol and of that mass 53.28 % is Oxygen
∴ molar mass of oxygen in compound = 180.18 g/mol × (53.28 ÷ 100)
≈ 96 g/mol
since a single oxygen= 16 g/mol
then number of oxygen in compound = 96 ÷ 16 g/mol
= 6 OXYGEN atoms

∴ molecular formula of compound (aldehexose sugar e.g. glucose) = C₆H₁₂O₆

Answer from: Quest

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

Answer from: Quest

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

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What is the molecular formula for a compound if it is 39.99% carbon, 6.73% hydrogen, and 53.28% oxyg...

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