Answer:
Weather:
- The wind is blowing from the south.
- There is a thunderstorm warning.
- The average high temperatures for July in Yellowknife is 32.5 degrees Celcius.
- The wind is blowing at 56 km / hr.
Climate:
- The average temperature for February in Australia is 19 degrees Celsius.
- The average rainfall for June in Kenya is 3.3cm.
- 10mm of rain fell today.
- It is usually cold in Ottawa in January. -There was a cold weather advisory on Jan 21 2020.
-Hurricanes are most likely to hit the Gulf of Mexico and the Carribean.
Explanation:
Hope it helps.
The process involving separation of liquid/solid mixture as regards this question is Decantation.
- Decantation can be regarded as one of the process used in separation of liquid from solid as well as other immiscible (non-mixing) liquids through the removal of the liquid layer that is present at the top from the layer of solid/liquid which present at the below.
- In the process, the liquid will be poured slowly into another vessel as the pouring continues, then the solid will settle in the original vessel.
- This process can be done through tilting the mixture after the the top layer have been poured out.
<em>Therefore, decantation is one of the separation technique.</em>
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The mass of impure
is 20.7167 g. The decomposition reaction is as follows:

Here, 1 mole of
gives 1 mole of MgO.
Molar mass of
and MgO is 84.31 g/mol and 40.3044 g/mol respectively.
Converting number of moles in terms of mass,

Here, M is molar mass.
Since, 
Thus, 
On putting the values,

Rearranging,

Or,
...... (1)
Let the mass of impurity be
and mass of impure
is 20.7167 g thus,
...... (2)
Also, mass of impure MgO is 16.8817 g thus,
...... (3)
On comparing equations (2) and (3),

Putting the value of
in equation (1),

Or,

Or,

Or,

Or,

Thus, magnesium carbonate present in the original sample is 7.35 g.