A sample of neon gas occupies a volume of 7 mL at 25°C. What volume will the gas occupy at 7°C if the pressure remains constant?
a. 6.6
b. 6.6
c. 7.2
d. 8.4e-5
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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