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A sample of D-ribose(C₅H₁₀O₅) with mass 0. 727 g was weighed into a calor

A sample of D-ribose（C₅H₁₀O₅) with mass 0. 727 g was weighed into a calor

A sample of D-ribose(C₅H₁₀O₅) with mass 0. 727 g was weighed into a calorimeter and then ignited in presence of excess oxygen. The temperature rose by 0.910 K when the sample was combusted. In another separated experiment in the same calorimeter the combustion of 0. 825 g of benzoic acid,for which the Δ_cU^Θ_m= 3251 kJ·mol^-1,gave a temperature rise of 1.940 K. Calculate the Δ_rU^Θ_mand Δ_rH^Θ_mof D-ribose combusted.

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