Question: please solve this question I need answer this please please If the required dose of calcium hydroxide needed to soften water to the desired value

please solve this question I need answer this please please If

please solve this question I need answer this please please

If the required dose of calcium hydroxide needed to soften water to the desired value = 250 mg/L as CaCO3, how many kilograms of CaO is required per day for this treatment process, if the purity of lime = 90%? Given: (atomic weights: Ca = 40, 0 = 16, H = 1), flow rate = 0.1 m3/s = a. 1344 b. 1921 c. 2400 d. 1104

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