B is the correct answer for it
The Probability of spending at least half an hour on exactly one subject is mathematically given as
P(1)= 0.50
<h3>What is the
Probability of spending
at least
half an
hour on exactly one
subject </h3>
Question Parameters:
The amount of study time that Actuary Tong will spend on each exam in a day follows a continuous random variable that ranges from 0 to 1 hour.
Generally, the equation for the Probability of spending at least half an hour on a subject is mathematically given as
P(A)= (1 – 0.5)/(1 – 0)
P(A)= 0.5
Hence, the Probability of spending at least half an hour on exactly one subject is mathematically given as
P(1)=2C1 * 0.5 * 0.5
P(1)= 0.50
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Answer : The molar solubility of 
is 
Explanation :
The solubility equilibrium reaction will be:
The expression for solubility constant for this reaction will be,
Let the molar solubility be, 'x'
Now put all the given values in this expression, we get:
Therefore, the molar solubility of is
The chemical reaction is written as:
<span>Mg + 2HNO3 = Mg(NO3)2 + H2
We use this reaction and the amounts given to calculate the theoretical yield of the reactants. Then, we can calculate for the percent yield We do as follows:
20 g Mg (1 mol / 24.31 g) ( 1 mol H2 / 1 mol Mg ) (2.02 g / 1 mol ) = 1.66 g H2 theoretical
Therefore,
Percent yield = 1.66 / 1.7 x100 = 97.8%</span>
