You are the fund manager of the Zinc Blurb property unit trust. Your trust has g

Question

You are the fund manager of the Zinc Blurb property unit trust. Your trust has gained a good reputation as a safe investment because it guarantees profits for its unit holders. This guarantee means that if the unit trust does not make a profit, the payments made to the unit holders must come from funds that are borrowed elsewhere. Historically, the probability that the unit trust makes a profit has been 0.78.
Unfortunately for you, the prices of property have been falling rapidly which may have a drastic impact on whether your unit trust will make a profit. Real estate experts have stated that given the property boom that has been occurring in recent years, the probability of such a rapid fall in property prices is 0.54. The real estate analyst for the fund states that the probability that such a rapid fall in property prices occurs, given that a profit on your unit trust has been made, is 0.18.
To help with your analysis, you have defined the following events:

Explanation / Answer

This is a question about metal reacting with acid. Copper, being an unreactive metal, does not react with HCl. So, it is the zinc that reacted with HCl, giving off the hydrogen gas. Equation of reaction: Zn + 2 HCl -> ZnCl2 + H2 Volume of H2 gas produced at s.t.p. = 420 cm3 = 0.420 dm3 Molar volume of gas at s.t.p. = 22.4 dm3 mol-1 Amount of H2 gas produced in the reaction = (1/ 22.4) * 0.420 = 0.01875 mol Comparing mole ratio, 1 mol of Zn gives off 1 mol of H2 Amount of Zn reacted = (1/1) * 0.01875 = 0.01875 mol Mass of Zn reacted = Amount x Ar = 0.01875 * 65.4 = 1.226 g ...

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