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determine the enthalpy change if the heat

Determine the enthalpy change if The heat released when 24.9 grams of Potassium K reacts with excess H2O water is 124 kilo joules?

A female suffering from hypothermia(is dangerously low body temperature, below 95 °F (35 °C) has a sodium ion(Na+) concentration in the blood of 0.111 M and a total blood volume of 4.5 Litres . determine the mass of NaCl would require to be mixed to the blood to bring the sodium ion concentration up to 0.140m(, assuming no change in blood volume)

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