# Chemical Forums

• April 22, 2018, 10:19:17 AM
• Welcome, Guest

•

•

### Site friends

Pages: [1]   Go Down

### AuthorTopic: How many grams and moles of CO2 gas??  (Read 12520 times) !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() {var po = document.createElement("script"); po.type = "text/javascript"; po.async = true;po.src = "https://apis.google.com/js/plusone.js";var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(po, s);})();

0 Members and 1 Guest are viewing this topic.

#### Lindsay

• Regular Member
• Mole Snacks: +2/-0
• Offline
• Posts: 24
##### How many grams and moles of CO2 gas??
« on: November 11, 2008, 04:22:22 PM »

Problem 1

A 1.719 g sample of a CaCo3 mixture is thermally decomposed, evolving CO2. After the reaction, the mixture has a mass of 1.048 g

a. How many grams and moles of CO2 gas are evolved?
1.719 g - 1.048 = 0.671 g CO2

b. How many moles and grams of CaCO3 are in the mixture?

0.0152 mole of CO2 * 1 mol CaCO3/ 1 mol CO2 = 0.0152 mol CaCO3
* 100.09 g CaCO3/ 1 mol CaCO3 = 1.52 g CaCO3

Is the formula for this problem CaCO3 ---- CaO +CO2??

Lindsay
Logged

#### AWK

• Retired Staff
• Sr. Member
• Mole Snacks: +445/-78
• Offline
• Gender:
• Posts: 6186
##### Re: How many grams and moles of CO2 gas??
« Reply #1 on: November 11, 2008, 07:12:06 PM »

Quote
a. How many grams and moles of CO2 gas are evolved?
1.719 g - 1.048 = 0.671 g CO2

And moles ?
Logged
AWK

#### Borek

• Mr. pH
• Deity Member
• Mole Snacks: +1588/-392
• Offline
• Gender:
• Posts: 24130
• I am known to be occasionally wrong.
##### Re: How many grams and moles of CO2 gas??
« Reply #2 on: November 11, 2008, 08:43:27 PM »

A 1.719 g sample of a CaCo3 mixture

Mixture? What are other components of the mixture? Is there any other source of CO2 between them?
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

#### Lindsay

• Regular Member
• Mole Snacks: +2/-0
• Offline
• Posts: 24
##### Re: How many grams and moles of CO2 gas??
« Reply #3 on: November 12, 2008, 04:14:25 AM »

a. How many grams and moles of CO2 gas are evolved?
1.719 g - 1.048 = 0.671 g CO2

0.671 g CO2 * 1 mol CO2/44.01 g = 0.0152 mol of CO2

Mixture?? I have given you the complete problem. I'm thinking maybe CaO is the other one.

Thanks,

Lindsay
Logged

#### Borek

• Mr. pH
• Deity Member
• Mole Snacks: +1588/-392
• Offline
• Gender:
• Posts: 24130
• I am known to be occasionally wrong.
##### Re: How many grams and moles of CO2 gas??
« Reply #4 on: November 12, 2008, 06:16:37 AM »

Question is whether CaCO3 is the only source of carbon dioxide. If it is - your reaction equation is all that you need to find the correct answer.

Note: don't round down intermediate results. I mean - write them here rounded down, but use full available precision when entering them into next steps of calculations. I got 1.53 g of CaCO3 and I bet our results differ (1.52g vs 1.53g) because you have rounded down number of moles to 0.0152.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info
Pages: [1]   Go Up

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.075 seconds with 23 queries.