4)All the Carbon in Hydrocarbon will completly converted to CO2 So the number of

Question

4)All the Carbon in Hydrocarbon will completly converted to CO2
So the number of moles of CO2 = mass of CO2 / Molar mass of CO2
= 8.80 g / 44 (g/mol )
= 0.2 mol
Each CO2 has 1 mole of C in it, therefore the number of moles of C = moles CO2 = 0.2 mol
All the Hydrogen present in the given hydrocarbon will ends up into H2O
So the number of moles of H2O = mass of H2O / Molar mass of H2O
= 1.44 g / 18(g/mol)
= 0.08 mol
Each H2O has 2 H atoms, so number of moles of H = 2 x number of moles of H2O = 2x0.08 = 0.16 mol
The ratio of moles Of C to H is = 0.2mol : 0.16mol= 5:4
Therefore the emperical formula is C5H4

6)

a) enthalpy is an extensive property

b) number of neutrons is equal to atomic mass-atomic number

So the number of neutrons in carbon 13 are 7

Carbon 14 are 8

c) Potassium is a metal

h) Redox reaction involve change in oxidation States.

Remaining all are correct

Explanation / Answer

4. Combustion analysis of naphthalene, a carbon and hydrogen-containing compound often use in mothballs, produced 8.80g of Co, and 1,44g H-0. Calculate the empirical formula for naphthalene. (8 points) 5. Complete the following table: (1 points each; 5 points total) Formula Name c l2 CO HcI IO Disulfur tetfafluorideSaF Reid Chlorous acid Heio, cher 13-6.7 6. True or false? (1 points each; 10 points total) sa. Enthalpy is an intensive property Fas e 3 b. Carbon 13 and nitrogen-14 have the same number of neutrons T Potassium is a non metal Fase d, Density is a base unit e. Marie Curie discovered isotopes False f. Work is a state function Faise All nitrates are soluble uS Redox reactions do not involve changes in oxidation state (-) Ions are formed when atoms lose organ electrons- Fahrenheit and Celsius degrees are the same sze-Fais4- 100M

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