5. The balanced equation for production of carbon dioxide is...

5. The balanced equation for production of carbon dioxide is C(s) + O2(g) à CO2(g). How many grams of CO2 are produced when 74 grams of carbon react with an excess of oxygen? 6. Based on the answer from question 5, how many grams of oxygen are needed to completely react with 74 grams of carbon to produce the carbon dioxide? 7. Based on the answers from questions 5 and 6, how many moles of oxygen are needed to completely react with 88 grams of carbon to produce carbon dioxide? 8. Based on the chemical equation 2H2 + O2 à 2H2O, how many oxygen gas molecules do you need to make 3.0 g of water vapor (H2O)?

Transcript

00:01 A balanced chemical equation for the production of carbon dioxide is carbon as a solid plus oxygen diatomic as a gas, and that will yield carbon dioxide also as a gas.

00:16 How many grams of co2 are produced when 74 grams of carbon are reacted with excess oxygen? so this is an excess.

00:30 So the first thing we're going to do is we're going to convert these grams of carbon into moles.

00:36 So we'll say 74 grams of carbon, and we use a ratio of one mole is equal to 12 .01 grams.

00:46 So our grams of carbon cancel out.

00:49 Now we have to convert these two moles of carbon dioxide.

00:54 So for every one mole of carbon, you will make one mole of carbon.

00:58 Of carbon dioxide.

01:01 So now we convert one mole of co2 into grams, which is 44 .01 grams.

01:11 Notice this time the grams are on the top.

01:14 And that's what we're looking for, so we don't cross it out.

01:21 Moles cancel of carbon dioxide, moles of carbon cancel, we're left with grams.

01:27 So we take 74, divide it by 12 .01, multiply it by 1 over 1, and then multiply it by 44 .01 grams.

01:37 So for every 74 grams of carbon that you have, you should end up with 271 .169 grams of co2.

01:49 So how many grams of oxygen are needed to completely react with the 74 grams of carbon to produce this amount of carbon dioxide? so what we can do is we can use the 74 grams again, and we will convert it to moles just like we did before.

02:11 And again, we have a one -to -one ratio.

02:13 So one mole of oxygen reacts completely with one mole of carbon.

02:20 This time, we're going to go from one mole of diatomic oxygen, and the mass is going to be 32 .00 grams.

02:32 So we'll take 74, divide it by 12 .01, multiply it by 1 over 1, and then multiply it by 32.

02:41 And you will need 197 .169 grams of oxygen to completely react with all of your carbon.

02:52 How many moles of oxygen are needed to completely react with 88 grams of carbon to produce carbon dioxide? so now we are looking for moles of oxygen.

03:05 So i'm going to give us a little more room.

03:09 So we have 88 grams of carbon...

Question

Please give Ace some feedback