Question

Pressure cookers increase cooking speed by raising the boiling temperature of water above its value at atmospheric pressure.(a) What pressure (in Pa) is necessary to raise the boiling point to 200.0°C? Pa(b) What gauge pressure (in atm) does this correspond to? atm

Answer 1

Answer:
`\begin{gathered} a)\text{ P = 1.55}*10^6Pa \\ b)P_g=14.4atm \end{gathered}`Step-by-step explanation:

The pressure needed to raise the boiling point of water to 200.0°C can be gotten from the graph of temperature versus saturation pressure of water

Checking from the graph:

The water pressure necessary to raise the boiling point to 200.0°C = 1554900 Pa

`P=1.55*10^6Pa`

b) To calculate the gauge pressure, follow the steps below

`\begin{gathered} P_g=P-P_(atm) \\ \\ P_g=(1.55*10^6)-(1.01*10^5) \\ \\ P_g=1.45*10^6Pa \\ \\ P_g=(1.45*10^6)/(1.01*10^5) \\ \\ P_g=14.4\text{ atm} \end{gathered}`