Answer:
124.6 g/mol will be the molar mass for the unknown non-electrolyte
Explanation:
Freezing point depression → ΔT = Kf . m
ΔT indicates the temperature variation:
Freezing point of pure solvent - Freezing point of solution
Kf is the cryoscopic constant → 29.8 K/m
Generally the unit is °C/m but we have to type the ΔT by K so let's replace the data given → 7.03 K = 29.8 K/m . m
m = 7.03 K / 29.8 m/K = 0.236 mol/kg
m means molality, the moles of solute in 1 kg of solvent. If we want to determine the moles of solute we do this operation:
molality . kg, so we may convert the mass of solvent from g to kg.
50 g . 1kg/1000g = 0.05 kg
0.236 mol/kg . 0.05 kg = 0.0118 moles
Molar mass → g/mol → So 1.47 g / 0.0118 mol = 124.6 g/mol
Answer:
Melting is endothermic, so the air temperature decreases.
Explanation:
Hello there!
In this case, according to the given statement, it is possible to infer that the ice is melt because energy is applied to the ice and thereafter its temperature increases; this is possible because the joined particles of a solid substance need energy to undergo such a separation that they become more far away to each other and therefore transcend to the liquid phase due to the new molecules arrangement. Thus, the answer is Melting is endothermic, so the air temperature decreases because as the ice heats up, the air cools down as it gives it energy to the ice.
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Answer: Mars
Explanation: The planet of Mars is the only planet of all that is terrestrial. Jupiter, Saturn and Neptune are all Jovian Planets. The answer to the question is Mars. Hope this answer helps you!
