What is the enthalpy change (in J) for converting 9 g of H ₂ O (l) at +10^ C to H ₂ O (l) at +20^ C ? ( C _ p ( H ₂ O . . (1)) .=75 ~J ~mol ⁻¹ ~K ⁻¹ ) ( . density of . H ₂ O ( l )=1 ~g ~mL ⁻¹ )

Step-by-step solution

We know that, H=C_p T Given aligned & C _ p =75 ~J ~mol ⁻¹ k ⁻¹ & ~T ₁=283 k & ~T ₂=293 k aligned array r mole ( n )= Weight of H ₂ O Molecular weight of H ₂ O 9 18 = 1 2 ~mol array aligned & H =75 ~J ~mol ⁻¹ k ⁻¹(293-283) k 1 2 ~mol & H = 750 2 ~J & H =375 ~J aligned