A geochemist in the field takes a small sample of the crystals of mineral compound X from a rock pool lined with more crystals of X. He notes the temperature of the pool, 30.° C, and caps the sample carefully. Back in the lab, the geochemist dissolves the crystals in 750. mL of distilled water. He then filters this solution and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.113 kg. Using only the information above, can you calculate the solubility of Xin water at 30.° C? If you said yes, calculate it. Be sure your answer has a unit symbol and 3 significant digits. O yes O no 0 ロ・ロ X olo 0° Ś
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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Calculating solubility
Using only the information above, can you calculate
the solubility of Xin water at 30.° C ?
Explanation
If you said yes, calculate it.
Be sure your answer has a unit symbol and 3
significant digits.
A geochemist in the field takes a small sample of the crystals of mineral compound X from a rock pool lined with more crystals of X. He notes the temperature
of the pool, 30. C, and caps the sample carefully. Back in the lab, the geochemist dissolves the crystals in 750. mL of distilled water. He then filters this
solution and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.113 kg.
Check
X +
■
Q Search
O yes
O no
0
0.0
X
LDLC
Н
olo
09
OD 0/3
Ś
0
Andrew V
2
olo
Ar
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