TS EAMCET · Chemistry · Some Basic Concepts of Chemistry

While combusting in air, $4 g$ of $H_{2}$ gas was completely converted into water. If $36 μmole$ of ${CO}_{2}$ from air is dissolved into that water, what is the concentration of ${CO}_{2}$ ?

A $1 μM$
B $1 mM$
C $1 nM$
D $1000 mM$

Verified Solution

Answer & Solution

Correct Answer

(B) $1 mM$

Step-by-step Solution

Detailed explanation

The reaction is as follows: 2H24 g+O2→2H2O36 g Concentration = Moles (n)Volume (V) Concentration of CO2=36×10-636×10-3=1mM

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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While combusting in air, 4 g of H2 gas was completely converted into water. If 36μmole of CO2 from air is dissolved into that water, what is the concentration of CO2 ?

Step-by-step Solution

While combusting in air, $4 g$ of $H_{2}$ gas was completely converted into water. If $36 μmole$ of ${CO}_{2}$ from air is dissolved into that water, what is the concentration of ${CO}_{2}$ ?