Answer:
An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. Cooling a liquid decreases the speed of the molecules.
Explanation:
One possible answer could be that a chemical reaction has occurred.
D iron oxide Fe is a transition metal
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As the volume increases, there is more space so the average distance between the gas molecules also increases.
Explanation:
The given data is as follows.
Volume = 1 L, Concentration of Ca = 5 ppm or 5 mg/L
As 1 mg = 0.001 g so, 5 mg /L will be equal to 0.005 g/l. Molar mass of calcium is 40.078 g/mol.
Hence, calculate molarity of calcium as follows.
Molarity of Ca = 
= 
Molarity of Ca = 
Hence, molarity of
is
. Since, volume is same so, moles of calcium chloride will be
.
Thus, we can conclude that mass of
will be as follows.
(molar mass of
= 110.984 g/mol)
= 0.0138 g
Thus, we can conclude that mass of
is 0.0138 g.