HELPPP 1.How much heat is required to evaporate 250 g of water to the boiling point?And is it endothermic or exothermic

2. How many kilojoules of heat is needed to evaporate 750 g of water to boiling point?And is it endothermic or exothermic

3. How many kilojoules of heat is needed to melt 500 g of water to freezing point? And is it endothermic or exothermic

b

explanation:

mitosis

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

1 is the answer to this problem