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1. In the reaction Mg(OH)2 + 2HCl → MgCl2 + 2H2 O, you were given 15
grams of Mg(OH)2 and 25 grams of HCl. Which of the two reactants is the
limiting reagent? How much MgCl2 will be produced in the reaction? (Mg(OH)2
= 58.32 g/mol, HCl = 36.46 g/mol, MgCl2 = 95.32 g/mol)
7. Manila, the most populous city, has approximately 4.12x10^7 people
living in it. The population of the entire National Capital Region (NCR) is
approximately 3.1X10^8 people. About how many times greater is the
population of NCR than the population of Manila?
8. A box contains 5.125X10^4 thumb tucks. The mass of each thumb tuck is
8.1X10^-6 kilograms. What is the combined mass of the thumb tucks in
the box?
9. A microscope is set so it makes an object appear 4.3X10^3 times larger
than its usual size. A virus has a diameter of 2.7X10^-8 meter. How large
will the diameter of the virus appear when it is viewed under the
microscope?
10. 1.2 yottameter to yoctometer
. Calculate the percent by mass of sodium hypochorite in her disinfectant solution. (
5Tbsp. of NaClO (sodium hypochlorite) and 3.8 liters of H2O (water). In units of grams
for both of the solute and solvent.
Note: Assume that the population is infinite in this case and solve.
Problem: The scores of individual students on a national test have a normal distribution with mean 18.6 and standard deviation 5.9.At Federico Ramos Rural High School, 76 students took the test. If the scores at this school have the same distribution as national scores, what are the mean and standard deviation of the sample means for 76 students.
Table:
Steps Solution
1.Identify the given formation.
2.Find the mean of they sampling distribution. Use the property that Mx=M
3.find the standard deviation of the sampling distribution.
Consider a population consisting of 2,5,6,8, and 10. Suppose samples of size 2 are drawn from this population.
Q1.Compute the mean and the standard deviation of the population.
Q2. List all samples of size 5 and compute the mean for each sample.
Q3. Construct the sampling distribution of the sample means.
Q4. Calculate the mean of the sampling distribution of the sample means.
Q5. Calculate the standard deviation of the sampling distribution of the sample means.
The records of a certain hospital showed that the length of stay of its patients is normally distributed with a mean of 11.5 days and a standard deviation of 2 days. Find the standard score that corresponds to a hospital stay of 9 days.
Based on the below reaction, how many moles of CO2 will be produced if 14.45 moles of O2 react completely with excess C3H8? Round your answer to 2 places after the decimal. You do not need to include units.
C3H8 + 5O2 --> 3CO2 + 4H2O
Based on the below reaction, how many moles of NH3 will be produced, if 28.23 moles of H2 react completely with excess N2? Round your answer to 2 places after the decimal.
N2 + 3H2 --> 2NH3
Based on the below reaction, how many moles of N2 are need to react completely with 10.42 moles of H2? Round your answer to 2 places after the decimal.
N2 + 3H2 --> 2NH3
1. In a 35.0 L automobile air bag, a sample of gaseous nitrogen has a pressure of 745 mm Hg. If this
sample is transferred to a 25.0 L bag at the same temperature, what is the final pressure of the gas?
