How many electrons must calcium lose to satisfy the octet rule?
1 answer:
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Answer:
a) 0,2% w/v
b) r=500
c) 0,0182 M
d) 0,0145 m
e) 0,0137 equivalents
Explanation:
a) % w/v means mass of solute in grams per 100 mililiter of solution. Thus:
%w/v= ×100 = 0,2%w/v
b) Ratio strength is a way to express concentration. For w/v is in 1g of solute <em>r</em> mililiters of solution have. Thus, r = 500 because we have in the first 1 g of CaCl₂ in 500 mL of solution.
c) Molarity is moles of solute per liter of solution, thus:
1,000 g of CaCl₂ × = 9,09×10⁻³ moles of CaCl₂
500 mL of solution × = 0,500 L of solution
M = = 0,0182 M
d) Molality is moles of solute per kg of solution.
Specific gravity is the ratio between density of the solution and density of a reference substance (Usually water). With a specific gravity of 0,8:
kg of solution = 0,500 L of solution × =<em> </em><em>0,625 kg of solution</em>
m = = 0,0145 m
e) In a salt, equivalents are the number of moles ables to replace one mole of charge. In CaCl₂ is ¹/₂ because with ¹/₂ moles of CaCl₂ it is possible to replace 1 mole of charges. Thus, in 1,5 L there are:
1,5 L × ×
= 0,0137 equivalents
I hope it helps!
Answer:
Hi.
The temperature is approximately zero degrees (0°C)
Explanation:
It is important to keep in mind that in the production of ice cream the decrease in the freezing point of the water present in the mixture is called the antifreeze power of the mixture. In ice cream, the freezing point decrease will be caused by each substance that is dissolved in the mixture: lactose, salts, sugars and any other substance. Each of these substances will contribute to the decrease in the freezing point of the mixture. The phase diagram attached in the file shows the sugar solutions in water. When a solution cools (point A), there comes a time when the freezing curve is reached (point B). At that moment ice begins to appear. As shown in the diagram this temperature is approximately zero degrees (0 ° C).
