Question

I am HORRIBLE at chemistry, Can somebody help me out with this question please.

Carbonic acid (H2CO3) forms when carbon dioxide (CO2) dissolves in water according to this equation:

CO2 + H2O→H2CO3

How many moles of CO2 must dissolve in an excess of water to produce 4 moles of H2CO3 ?
A. 1 mol
B. 2 mol
C. 3 mol
D. 4 mol

Answer 1

D

Step-by-step explanation:

if CO2 +H2O = 1 H2CO3 then 4 CO2 would be 4 moles I think

Answer 2

There must dissolve 4 moles of CO2 (Option D is correct)

Step-by-step explanation:

Step 1: Data given

Number of moles H2CO3 produced = 4 moles

Step 2: The balanced equation

CO2 + H2O → H2CO3

Step 3: Calculate moles of CO2

For 1 mol of CO2 we need 1 mol of H2O to produce 1 mol of H2CO3

For 4 moles H2CO3 produced we need 4 moles of CO2.

There must dissolve 4 moles of CO2 (Option D is correct)