What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\) \(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)

Assessment: WAEC SSCE - Chemistry - 2018 (Objective) Subject: Chemistry

Question 1 Report

What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\) \(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)

Answer Details

 

n = cv where n = no of mole, c = molar concentration(mol/dm3) and v = volume( dm3)

volume =  500

cm3
𝑐 𝑐 π‘š 3  = 0.5dm3, c = 0.005moldmβˆ’3
π‘š π‘š π‘œ 𝑙 𝑑 π‘š βˆ’ 3 massmolarmass
π‘š π‘š π‘Ž 𝑠 𝑠 π‘š π‘œ 𝑙 π‘Ž π‘Ÿ π‘š π‘Ž 𝑠 𝑠  =  0.0025 = mass98
π‘š π‘š π‘Ž 𝑠 𝑠 98  (where 98g/mol is the molar mass of H2SO4)

number of mole(n) = c x v = 0.5 X 0.005 = 0.0025mol.

but n = 

mass of H2SO4 = 0.0025 x 98 = 0.245g.

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