anonymous
  • anonymous
50 grams of propane (c3h8) is oxidized (combusted/burned) completely to co2 and h20 by reaction with 300 grams of pure oxygen (o2). What is the composition of the reaction products in grams? grams of c02= grams of h20= grams of c3h8= grams of 02=
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Rushwr
  • Rushwr
first write the balanced equation
anonymous
  • anonymous
i did but i am still confused like i balanced it like this: C3H8+5o2-->3Co2+4h20
Rushwr
  • Rushwr
yep

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Rushwr
  • Rushwr
find the no. of moles of C3H8 moles = mass divided by molar mass
anonymous
  • anonymous
what should i do after i get the moles
Rushwr
  • Rushwr
moles of CO2 = 3 times of moles of C3H8
Rushwr
  • Rushwr
use the same equation moles = mass/ molar mass
Rushwr
  • Rushwr
then we can find mass
Rushwr
  • Rushwr
of CO2
anonymous
  • anonymous
should i find the moles of all of them first
Rushwr
  • Rushwr
yeah yeah
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
now how do i find the mass
Rushwr
  • Rushwr
mass = molar mass * moles
anonymous
  • anonymous
the masses i got don't add up to 350 idk y
anonymous
  • anonymous
thank you though :)
Rushwr
  • Rushwr
wait I'll check for u
Rushwr
  • Rushwr
Mass of CO2 is 150 g approximately
Rushwr
  • Rushwr
Mass of H2O = 81.8 g approximately
Rushwr
  • Rushwr
Looking at the stoichiometric ratio we can see the ratio of moles of C3H8: O2 is 1:5 That means 1 moles of C3H8 reacts with 5 moles of O2 We know the no. of moles of C3H8 that was 1.136 right? That means to oxidise C3H8 completely we need (1.136 *5) moles right? so no. of moles of O2 needed = 5.68 moles But we are said that we have 300 g of O2 Using that mass we should find the no. of moles of O2 . The total O2 present Total moles = 300/32 = 9.375 But to complete the reaction we only need 5.68 moles of O2 That means O2 is in excess. So that will remain in the products side. The remaining would be 9.375 - 5.68 = 3.695 moles Now we can find the mass of O2 remaining mass = 3.695 * 32= 118.24g
anonymous
  • anonymous
oh okay thank you so much
Rushwr
  • Rushwr
No problem ... hope you got it :)

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