Moles and Reactions..

Hello TSR,

Can anyone please help me with this question...

What volume of CO2, measured at RTP, is formed by the decomposition at RTP of 5.04g of NaHCO3?

2 NaHCO3 ---> Na2 CO3 + CO2 + H2 O

................: 5.04g :.............:................

n = m/M

n = 5.04g/84.01 g mol-1

= 0.05999285799 mol

2 mol : 1 mol : 1 mol : 1 mol

CO2 = 0.05999285799 mol

n = V/24.0

0.05999285799 mol multiply by 24.0 = V

V = 1.439828592 dm3...

I showed this to my teacher and she told me that the answer was 0.72 dm3...

Can anyone tell me where i have gone wrong??? :s-smilie:

Reply 1

Farseer

14

you need to halve the number of CO2 moles

Reply 2

apo1324

OP

11

Why do i have to do that, because its the same ratio... :frown:

Reply 3

Farseer

14

You have 2 NaHCO3 on the LHS and 1 CO2 on the RHS

Reply 4

apo1324

OP

11

Ahh.. Thanks for you help!!

Reply 5

?!master?!mini?!

16

1 mole of gas at rtp is 24dm-3

Reply 6

dasha962

5

Question help please and if you would explain please. Thanks

a sample of limestone (impure calcium carbonate) weighing 0.20g was reacted with 50cm3 of 0.10 mol dm-3 Hydrochloric acid

CaCO3 + 2HCL = CaCl2 + CO2 + H2O

The hydrochloric acid was in excess, and this excess just reacted with 14cm3 of 0.10 mol dm-3 sodium hydroxide.

A) what excess volume of 0.10 mol dm-3 hydrochloric acid reacted with 14cm3 of 0.10 mol dm-3 sodium hydroxide?

Bi) what volume of 0.10 mol dm-3 hydrochloric acid reacted with the calcium carbonate in the limestone?

ii) how many moles of hydrochloric acid reacted with the calcium carbonate?

iii)how mant moles of calcium carbonate reacted with hydrochloric acid?

iv) what mass of calcium carbonate reacted?

Reply 7

Anon the 7th

dasha962

Question help please and if you would explain please. Thanks

a sample of limestone (impure calcium carbonate) weighing 0.20g was reacted with 50cm3 of 0.10 mol dm-3 Hydrochloric acid

CaCO3 + 2HCL = CaCl2 + CO2 + H2O

The hydrochloric acid was in excess, and this excess just reacted with 14cm3 of 0.10 mol dm-3 sodium hydroxide.

A) what excess volume of 0.10 mol dm-3 hydrochloric acid reacted with 14cm3 of 0.10 mol dm-3 sodium hydroxide?

Bi) what volume of 0.10 mol dm-3 hydrochloric acid reacted with the calcium carbonate in the limestone?

ii) how many moles of hydrochloric acid reacted with the calcium carbonate?

iii)how mant moles of calcium carbonate reacted with hydrochloric acid?

iv) what mass of calcium carbonate reacted?

thats 5 times youve posted this

create your own thread and dont bump/use other peoples

Reply 8

Y5N_16

1

Its amazing how 11 years later I got the same question and same answer as you LOL.

Reply 9

5hyl33n

Volunteer Team

21

Original post by Y5N_16

Its amazing how 11 years later I got the same question and same answer as you LOL.

Do you understand how to get to the correct answer?

Also, please avoid bumping old threads. :smile:

(edited 3 years ago)

Reply 10

Y5N_16

1

Original post by 5hyl33n

Do you understand how to get to the correct answer?

Also, please avoid bumping old threads. :smile:

yes I got the answer thanks.

(why is it bad to reply to old threads? Just asking bcos I'm new here 🤔)

(edited 3 years ago)

Reply 11

5hyl33n

Volunteer Team

21

Original post by Y5N_16

yes I got the answer thanks.

(why is it bad to reply to old threads? Just wanna know🤔)

The point of answering threads is to help OP if they have a problem. Usually, older threads have been answered, and the OP is not active anymore. When you bump a thread it's added to the 'latest' tab and newer threads are pushed down, which isn't fair to those who are online and waiting for an answer. :smile:

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