Answer:
4
Explanation:
the actual change in phase is 4 on the diagram
Explanation:
The given data is:
The mass% of a solution is 7.
Mass of solution =450g
The mass of salt required can be calculated as shown below:

Substitute the given values in this formula to get the mass of solute that is salt:

Mass of salt =31.5g
Mass of solvent that is water = 450g-31.5g=418.5g
Calcium carbonate is most likely to dissolve in water with:
e. Lots of Carbon dioxide and colder temperature.
Explanation:
- Calcium carbonate is very sparingly soluble in water. However, it has been observed to dissolve in cold water with higher concentration of Carbon dioxide.
- The reason behind the observation is the formation of Calcium bicarbonate which is soluble in water.
- Higher concentration of Carbon dioxide in water turns it acidic. When this acidic water reacts with calcium carbonate it forms Calcium bicarbonate which is soluble in water.
- So,Calcium carbonate is most likely to dissolve in water with lots of Carbon dioxide and colder temperature.
Answer:
not quite sure what you meant by the question but I think the answer you're looking for is biomass? not sure though