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1. Solid phosphorous reacts with chlorine gas to produce phosphorous chloride liquid.
How many grams of chlorine gas is required when 1.45 g of phosphorous was used?
2. What volume of hydrogen gas at STP is produced as sulfuric acid acts on 24 g of
calcium?
3.What weight of magnesium is needed to react with HCl to produce 67.2L of hydrogen
gas at STP?
4.What volume of oxygen gas is required to burn 50 L of acetylene gas C2H2 at STP?
A closed surface which encloses a charge has an electric flux of 15.8 N.m^2/C. What is the magnitude of the charge?
“Substance E is composed of clear, red crystals. When the red crystals are heated, they crackle and change into a blue liquid, which cools to form a blue solid. Heating also produces vapour of substance X, which condenses to form a liquid that is a non-conductor of electricity. The colourless liquid of substance X is cooled until it forms a white solid. The solid of substance X does not conduct electricity. The red crystals of substance E are found to be quite soluble in water, but they do not dissolve in kerosene. Neither the red crystals nor the blue solid conducts electricity, although the red aqueous solution of substance E is a good conductor.”
An electric field (E=4.5N/C) passes through a flat surface area (0.30m) with an angle of 45°. What will be the magnitude of the electric flux?
What volume of hydrogen gas at STP is produced as sulfuric acid acts on 24 g of
calcium?
what is the resistance of a 30 m silver wire with a 2 mm diameter
Two charges lie on positive x-axis. Charge A (5.0 x 10-9 C) is 4.0 cm from the origin and Charge B is 6.0 cm from the origin. (-7.0 x 10-9 C). What is the total force exerted by these two charges on Charge C (8.0 x 10-9 C) located at the origin?
Consider the following facts about mobile money transactions. Currently, MTN and AirtelTigo charge 1% on mobile money transactions up to a total charge of GHS 10 per transaction while Vodafone charges 0%. The E-levy which is currently being discussed is intending to impose an additional 1.5% charge on most electronic transactions.
“The research we did also told us that there will be about 24 per cent attrition rate in the three months to six months that we will introduce it. The same research told us what should be done to bring back these people after a while, and we have all these things in place”
Suppose that the 3-6 months constitute short-run and any period after that constitutes long-run. Based on the minister’s statement, is the demand for mobile money services more or less elastic in the short-run compared to the long-run? Is this consistent with whatwelearnedaboutelasticity in thisclass? Explain
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The average precipitation for the first 7 months of the year is 19.32 inches with a standard deviation of 2.4 inches. Assume that the average precipitation is normally distributed.
a. What is the probability that a randomly selected year will have precipitation greater than 18 inches for the first 7 months?
b. What is the average precipitation of 5 randomly selected years for the first 7 months?
c. What is the probability of 5 randomly selected years will have an average precipitation greater than 18 inches for the first 7 months?
Two charges lie on positive x-axis. Charge A (5.0 x 10-9 C) is 4.0 cm from the origin and Charge B is 6.0 cm from the origin. (-7.0 x 10-9 C). What is the total force exerted by these two charges on Charge C (8.0 x 10-9 C) located at the origin?
