Question

Kim realized that she needed to react the ZnO with HCI in a calorimeter, in order to get an accurate measurement

of the change in temperature resulting from the reaction. She used a graduated cylinder to transfer 50.0 mL of 1.00 M HCI is to a polystyrene cup calorimeter. Kim then weighed out .962 g of zinc oxide, with the intent of transferring the solid to the calorimeter. To get the .962 g ZnO, Kim placed a 15 mL beaker on the digital scale and zeroed the scale. She then used the small measuring spoon to scoop the ZnO into the beaker. Kim then inserted the thermometer into the hole in the middle of the polystyrene foam cover, placed the cover over the calorimeter cup, and measured the initial temperature of the acid solution in the calorimeter; the temperature was 21 C. After Kim transferred the solid ZnO to the calorimeter, a reaction occurs with all of the ZnO as it went into solution. Because the reaction equation included no gaseous products, Kim did not think there would be much bubbling or other sudden changes when the reactants were mixed. Nevertheless, Kim added the ZnO slowly, to reduce the likelihood of a violent reaction. The reaction mixture warmed to 25.4 C, as indicated by Kim’s temperature measurement of the calorimeter contents after reaction.

Calculate the change in pressure.

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