When the vapor pressure of water is $30 kPa$ the temperature of the water is

$20 ° C$

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$100 ° C$

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$70 ° C$

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$40 ° C$

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Solution

The correct option is C
$70 ° C$

Vapour pressure,
Vapour pressure also known as vapour equilibrium pressure, can be defined as the pressure exerted (in a system featuring thermodynamic equilibrium) by a vapour with its condensed phases (solid or liquid) in a closed system at a given temperature.
The following graph interprets the vapour pressure of four liquids as:
When we start at $30 kPa$ on the vertical axis and then draw a line parallel to the horizontal axis until we reach the vapour pressure curve for water.
Then drop a line vertically to the temperature axis. It meets the axis at $70 ° C$
Thus, the vapour pressure of water is $30 kPa$ at $70 ° C$ .

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