Question

mercury weighs more than water .would the pressure exerted by water is greater or less than the pressure exerted by the same amount of mercury

Answer 1

The pressure exerted by water is greater  than the pressure exerted by the same amount of mercury .
 Because,Lighter objects has more pressure.
since water weight < mercury weight

Answer 2

Density affects pressure too. The more dense a fluid is, the more pressure it exerts. That's because it has more mass per volume. There's more material in a denser fluid to exert pressure. Mercury exerts more pressure than water, because it is a lot denser than water. Water's density is 1.0 g/cm3. Mercury's density is 13.5 g/cm3.

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