1. A reaction occurs in a calorimeter, resulting in the starting and final temperatures shown below. What can you say about the reaction and the enthalpy change (AH) during the reaction? 38.8 °C Starting temperature: 21.0 °C A. The reaction is endothermic and AH is positive. ○ B. The reaction is endothermic and AH is negative. OC. The reaction is exothermic and AH is positive. D. The reaction is exothermic and AH is negative.

The sun supplies energy at a rate of about 1.0 kilowatt per square meter of surface area (1 watt =1 J/s). The plants in an agricultural field produce the equivalent of 13 kg of sucrose (C12 H22 O11) per hour per hectare (1 ha : 10,000 m²). Assuming that sucrose is produced by the reaction 12CO2 (g) + 11H2O(1) → C12 H22 O11 (s) + 1202 (g) AH=5640 kJ calculate the percentage of sunlight used to produce the sucrose that is, determine the efficiency of photosynthesis in this field. Percent efficiency %

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