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1) The vanillin molecule is the primary molecule present in vanilla extract. The molecular mass of vanillin is 152.08 grams per mole and contains 63.18% carbon, 5.26% hydrogen, and 31.56% oxygen. What is the molecular formula of vanillin?
2) A sample of fuel is found to contain 87.4% nitrogen and 12.6% hydrogen. If the molecular mass of the fuel is 32.05 grams/mole, what is the molecular formula of the fuel?
3) A compound is analyzed and found to have a mass of 289.9 grams/mole and contain 49.67% carbon, 48.92% chlorine and 1.39% hydrogen. What is the molecular formula of the compound?
4) A compound is analyzed and found to contain 35.66% carbon, 16.24% hydrogen and 45.10% nitrogen. What is the empirical formula of the compound?
The average diameter of sand dollars on a certain island is 3.60 centimeters with a standard deviation of 0.90 centimeters. If 36 sand dollars are chosen at random for a collection
Assume that the person holding the hand is asked to "Name an ace in your hand" and answers "The ace of hearts." What is the probability that he has a second ace?
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Among 134 randomly selected students, 9.3% refused to respond on a survey on cheating while among 154 male college students, 14.6% refused to respond to the same survey. Determine test statistic, critical values, p-value, and conclusion.
Simple Linear Regression vs. Multiple Linear Regression
listed below are the number of years that popes and british monarchs lived after their election or coronation. treat
Patients arriving at a hospital outpatient clinic can select one of three stations for service. Suppose that physicians are assigned randomly to the stations and that the patients therefore have no station preference. Three patients arrive at the ..
A biologist has found the average weight of 12 randomly selected mud turtles to be 8.7 lb with standard deviation 3.6 lb. find a 90% confidence interval for the population mean weight of all such turtles.
the proportion of americans who are satisfied with the way things are going in their lives is 0.76. suppose that a
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
Determine the mean, median and variance for this sample data. Construct a histogram and explain why the observed shape is not surprising, given the nature of the phenomenon in question.
On his return he is equally likely to enter, and leave his running shoes, either by the front or back door. If he owns a total of k pairs of running shoes, what proportion of the time does he run barefooted?
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