10.0g of calcium carbonate was heated. the mass of calcium oxide left was 5.6g. calculate the mass of carbon dioxide produced in the reaction.

Afraidsugar lol it’s the third one

The correct answer is b) false

B? i feel like this is a trick  

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m