In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?1)3.13 g
2)38.5 g
3)200 g
4)617 g
Answers
200 g is the mass of would be used. Hence, option C is correct.
Define the molarity of a solution.
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Total volume = 10 x 0.250 liters = 2.5 liters
M = n ÷ V
Total moles: n = M x V
= 0.720mol/liter x 2.5 liter
=1.8 mol
Molar mass = grams / n
1.8 mol x 110.98 g/mol
= 199.8 grams
Hence, option C is correct.
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M = n / V (liters)
Total moles: n = M*V = 0.720mol/liter *2.5 liter =1.8 mol
MM = grams / n --> grams = n*MM = 1.8 mol * 110.98 g/mol = 199.8 grams
Answer: option 3) 200 g.
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The volume = 6.71 L
Further explanation
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
V₁=7 L
T₁=25 °C(room temperature) + 273 = 298 K
T₂=12.5(halved) + 273 = 285.5 K
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To counter the removal of A the equilibrium change by shifting toward the left
explanation
If the reaction is at equilibrium and we alter the condition a new equilibrium state is created
The removal of A led to the shift of equilibrium toward the left since it led to less molecules in reactant side which favor the backward reaction.( equilibrium shift to the left)
For Plato users :
The equilibrium SHIFTS LEFT. Simultaneously, there’s an increase in the REVERSE reaction.