Using these masses, Mass of H2O 1.548 g and Mass of CO2 - 2.208 Convert those ma

ID: 890519 • Letter: U

Question

Using these masses, Mass of H2O 1.548 g and Mass of CO2 - 2.208

Convert those masses into the number of moles of H2O and CO2 produced from the unknown sample.

Moles of H2O - ? moles

Moles of CO2 - ? moles

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From the number of moles of H2O and CO2 produced in the last question, determine the number of moles of H atoms and C atoms in the sample.

Moles of H atoms - ? moles

Moles of C atoms - ? moles

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From the above and atomic masses of the elements, determine the masses of H and C in the sample.

Mass of H - ? g

Mass of C - ? g

: compound moles = mass of the compound (in gram)/ compound molar mass

H2O molar mass = 18

So 1.548 g H2O moles = 1.548/18 = 0.086 moles

CO2 molar mass = 44

So 1.548 g H2O moles = 2.208/44 = 0.050 moles

H2O contains two H atoms and one oxygen atom. So in one mole of H2O will contain 2moles of hydrogen and one mole of oxygen.

So in 0.086 moles of water will contain 2x0.086 hydrogens = 0.172 moles of hydrogen atoms

Similarly

0.050 moles of CO2 will contain 0.050 moles of C atoms

Moles = compound or atom mass in grams/ compound or atom atomic mass

H atom mass = moles of H atom x H atom atomic mass

0.172 moles of H atoms weight = 0.172 x 1 = 0.172g

C atom mass = moles of C atom x C atom atomic mass

0.050 moles of C atoms weight = 0.050 x 12 = 0.6 g

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