Define the First Law of Thermodynamics.

For an exothermic reaction carried out in a calorimetric experiment, the following temperature data were collected at $1-$ minute intervals with the exothermic reaction beginning at the fourth temperature reading: $22\mathrm{.}08,22\mathrm{.}18,21\mathrm{.}98,22\mathrm{.}08,26\mathrm{.}78,29\mathrm{.}18,30\mathrm{.}58,30\mathrm{.}48,30\mathrm{.}28,30\mathrm{.}18,29\mathrm{.}88,29\mathrm{.}68,29\mathrm{.}48,29\mathrm{.}38.$ Illustrate how the temperature expected for instantaneous reaction can be determined by extrapolation. Attach a sheet of graph paper.

How many moles of hydronium ions were converted to water when $75\mathrm{.}0ml$ of $1\mathrm{.}2M$ hydrochloric acid were neutralized by sodium hydroxide? $($Note: The terms hydronium ions and aqueous hydrogen jons are often used interchangeably.$)$