How many Joules of heat would be required completely melt 5.00 grams of H2O(s) at 0°C at to
H2O(C) at 0°C?

Heat would be required  : 1,670 J

Given

mass of H₂O=5 g

Required

Heat to melt

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

The heat of fusion for water at 0 °C : 334 J/g

Input given values in formula :

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

the answer for sodium is 0.186

the answer for rubidium is 0.251