After all the ice pieces with a volume of 1 square meter melt into water, what is the mass of water__ kg

After all the ice pieces with a volume of 1 square meter melt into water, what is the mass of water__ kg

When the density of ice is 0.9kg/m3, the mass of ice with a volume of 1m3 is 0.9kg. The melting process is only a change of state, and the mass of formed water remains unchanged, so it is still 0.9kg