Molality is one way of expressing concentration for solutions. It has units of moles of solute per kg of solvent. From the given values, we easily calculate for the moles of solute by multiplying the mass of solvent to the molality. We do as follows:
moles solute = 0.3 (10) = 3 mol solute
This problem is providing us with a statement in which we need to figure out the word fitting in the blank. At the end, after analyzing the information, the word turns out to be colligative as show below:
<h3>Colligative properties.</h3>
In chemistry, colligative properties of solutions account for the behavior of a solution with respect to the pure solvent, to which a solute is added.
Among them, we have boiling point elevation, freezing point depression, vapor pressure lowering and osmotic pressure, which are all affected by the concentration of the solute but not by the identity of the solute.
In such a way, we conclude that the correct word that fits in the blank is colligative as shown below:
"Colligative properties depend on the concentration of a solute in a solution but not on the identity of the solute."
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C. Convection currents in the air
Explanation:
Near the shore, winds tends to blow out towards the water at night and this is driven by convection currents in the air.
Convection occurs in fluids. Since we are dealing with wind, therefore, it is convection in air.
- At night, the air on land is cold and under high pressure.
- The shore area is able lose and gain heat very fast.
- At night, since the shore is cold, the air around is cold too.
- The ocean has high heat capacity and does not lose or gain heat easily.
- At night, it still retains come of its heat.
- This causes nearby winds to warm up, becomes less dense and rises.
- The wind here is moves towards the cold land
- The breeze on land moves outwards towards the ocean.
- This will then set up convection currents.
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Answer:
6.21 moles O
Explanation:
To find the moles of oxygen, you need to (1) convert grams Mn(ClO₄)₄ to moles Mn(ClO₄)₄ (via molar mass) and then (2) convert moles Mn(ClO₄)₄ to moles O (via mole-to-mole ratio from formula subscripts). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
Molar Mass (Mn(ClO₄)₄): 452.74 g/mol
1 Mn(ClO₄)₄ = 1 Mn and 4 Cl and 16 O
175.7 g Mn(ClO₄)₄ 1 mole 16 moles O
--------------------------- x ------------------- x --------------------------- = 6.21 moles O
452.74 g 1 mole Mn(ClO₄)₄
Dwarfs - A
Giants - C
Main Sequence Stars - B
Supergiants - D
