# chemistry

I have posted this once and still cannot get the correct answer.

Determine the mass of carbon monoxide that is produced when 45.6 of methane, CH4, react with 73.2 g of oxygen , O2. The products are carbon monoxide and water vapour.

1. 👍 0
2. 👎 0
3. 👁 321
1. This is a limiting reagent problem. You know that because BOTH reactants are given. Here is the system for working limiting reagent problems. Copy and memorize the steps.

1. Write a balanced equation.
2CH4 + 3O2 ==> 2CO + 4H2O

2a. convert 45.6 g CH4 to moles. moles = grams/molar mass.
45.6/16 = 2.85
2b. Do the same for moles O2. 73.2/32 = 2.2875

3a. Using the coefficients in the balanced equation, convert moles CH4 to moles CO.
2.85 mols CH4 x (2 moles CO/2 moles CH4) = 2 x (2/2) = 2x1= 2 moles CO.
3b. Do the same for moles O2.
2.2875 moles O2 x (2 moles CO/3 moles O2) = 2.2875 x (2/3) = 1.525 moles CO.
3c. Note that the answers for 3a and 3b don't give the same value for moles CO which means one of them is wrong. The correct answer in limiting reagent problems is ALWAYS the smaller value.

4. Convert the value from 3c to grams.
g = moles x molar mass. 1.525 x 28 = 42.70 g CO which I would round to 42.7. You need to confirm all of this as I estimated the molar masses of the above.

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### math,drbob222

I'm sorry the problems i posted had a couple of errors how i posted it here they are: Posted by DrBob222 on Friday, November 24, 2006 at 6:19pm in response to Math. Thanks for showing your work. It helps us to know where you are

asked by Jasmine20 on November 25, 2006
2. ### physics

A mass m is gently placed on the end of a freely hanging spring. The mass then falls 21.3 cm before it stops and begins to rise. What is the frequency of the oscillation? I found the same question (with a different length) posted

asked by Abby on June 12, 2014
3. ### Physics

Hello, I posted this a bit ago, but am not sure the suggested solution was correct. Two physical pendulums (not simple pendulums) are made from meter sticks that are suspended from the ceiling at one end. The sticks are uniform

asked by Anonymous on November 7, 2011
4. ### Math

I had posted this problem with you before and the answer given was 2b =A/h. The problem is: A = 1/2bh, which is not correct? Choices: 2A =bh, b=2A/b, 2b=A/h, b=2A/h When I got my test back 2b=A/h was correct. Did I make a mistake

asked by Jane on January 10, 2012
5. ### Physics

Hi I see another student actually posted this question... but got no answer... is someone able to look at it? see below - a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a

asked by LoveBug on November 2, 2014
1. ### solving Equations

Solve x square pluse 5x subtracting by 6 equals zero? X^2 + 5x - 6 = 0 Solve by factoring. 3 and 2 will do it. heres the right answer.... (x-1)(x+6)=0 x=1 x=-6 Let's see if that is the right answer. The first number is the product

asked by shanna on October 17, 2006
2. ### Help! for Chemistry H.W.

I need help with my chem home work. Please show me the answers because this question is a very confusing question to me. Therefore I really need you to provide the answer to this question please... Question 1: A sample of CO2 gas

asked by Lori on April 29, 2008
3. ### Science

Which procedure is the best way to find the correct mass of an object in a laboratory experiment? 1)make sure the balance works correctly before starting the measurement. Record the mass for three trials. Then average the masses.

asked by Nicole on October 17, 2013
4. ### Chemistry

1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are a. ƒ´Tf and Kf only. b. ƒ´Tf , Kf and mass of solute. c. ƒ´Tf , Kf , mass of

asked by Hannah on February 13, 2012
5. ### Educational Technology

'Scuse me, but I'd just like to check if my answer is right: 2. Which of the following is a true statement?: A. If it is printed or posted on the web, then it is a fact. B. Websites must go through a validity checker before they

asked by Porter Ballou on April 14, 2016

More Similar Questions