Questions asked by Deb P.
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The total pressure in an 12.1L automobile tire is 43.0psi at #19.0^@"C"#. How much does the pressure in the tire rise if it warms to a temperature of #34.0^@"C"# and the volume remains at 12.1L ?
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A 35.0mL sample of an unknown #HClO_4# solution requires 50.3mL of 0.109M #NaOH# for complete neutralization. What was the concentration of the unknown #HClO_4# solution? The neutralization reaction is: #HClO_(4(aq))+NaOH_((aq))→H_2O_((l))+NaClO_(4(aq))#
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Calculate the molality of a solution containing 275g glucose(#C_6H_12O_6#) dissolved in 1.08L of water? (Assume a density of 1.00 g/mL for water.)
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Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products #HCHO_(2(aq))+H_2O_((l))⇌H_3O_((aq))^(+)+CHO_(2(aq))^(-)#. Use A for #[HCHO_2]#, B for #[H_2O]#, C for #[H_3O^+]#, D for #[CHO_2^(−)]#?
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To what volume should you dilute 60mL of a 10.5M #H_2SO_4# solution to obtain a 1.70M #H_2SO_4# solution?
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Consider the reaction: #K_2S_((aq))+Co(NO_3)_(2(aq)) -> 2KNO_(3(aq))+CoS_((s)) darr#. What volume of 0.220M #K_2S# solution is required to completely react with 160mL of 0.145M #Co(NO_3)_2#?
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A laboratory procedure calls for making 600.0mL of a 1.1M #KNO_3# solution. How much #KNO_3# in grams is needed?
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A chemical reaction occurring in a cylinder equipped with a moveable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol of gas before the reaction and had an initial volume of 2.1L, what was its volume after the reaction?
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A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 745torr, and the water vapor has a partial pressure of 24 torr. What is the partial pressure of the hydrogen gas?
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A diver breathing heliox with an oxygen composition of 5.0% wants to adjust the total pressure so that #P_(O_2)= "0.21 atm"#. What must the total pressure be?
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In this reaction, 4.58L of #O_2# were formed at 745 mmHg and 308K. How many grams of #Ag_2O# decomposed? #2Ag_2O_((s)) -> 4Ag_((s)) + O_(2(g))#
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How many liters of oxygen (at STP) are required to form 10.5 g of #H_2O#? #2H_(2(g)) + O_(2(g)) -> 2H_2O_((g))#
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What volume in milliliters of #9.950*10^(−2)"M"# sodium hydroxide solution is required to reach the equivalence point in the complete titration of a 17.0mL sample of 0.114M phosphoric acid?
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Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00g of 32P, how many grams will remain after 70.0days ?
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Write a nuclear reaction for the neutron-induced fission of U−235 to produce Te−137 and Zr−97. please help?
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The total pressure in an 12.7L automobile tire is 42.0psi at #16.0^@"C"#. How much does the pressure in the tire rise if it warms to a temperature of #39.0^@"C"# and the volume remains at 12.7L ?
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Men ages(20-29) have meanheight 69.3 with s.dev of 2.5 in. An analyst wonders if sd of majorleague players less than 2.5 in. Heights of 20 random players are:72, 74, 71, 72,76,70,77,75,72,72,77,73,75,70,73,74,75,73,74,73. Can you help me find the P value?
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1545 subjects were given ginko & 1524 placebo. In ginko group, 246 developed dementian & in the placebo it was 277 with dementia. Significance level=0.01 to test claim(ginko is effective in dementia) Can you test claim and construct confidence interval?
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Angle F is 20 degrees more than three times the measure of angle H. What is the measure of angle F?
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If the range of a data set is 24. Find the approx value of the standard deviation, using the range rule of thumb?
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Which has a better relative position: a score of 75 on stats test with a mean of 60 and a standard deviation of 10 or a score of 36 on an accounting test with a mean of 30 and a variance of 16?
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The mean a person gets to work is 29.7 minutes. If the standard deviation is 6 minutes, within what limits would you expect approx 68% of the times to fall? Assume the distribution is approx bell shaped.
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A family has 3 children. Find the probabilities. A) all boys B) All boys or all girls C) Exactly two boys or two girls D) At least one child of each gender
What are the probabilities?
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In a game of craps, a player loses on the roll if a 2, 3, or 12 is tossed on the first roll. What is the probability of losing on the first roll?
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There are: 128,665 twins, 7110 triplets, 468 quadruplets, and 85 quintuplets. A)Find the probability that it represented more than two babies.B) Find the probability it represented quads or quints. C)choose one baby, whats the prob baby was a triplet?
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A) Look at table below. Find the probability the student is a female ages 25-34. B) Find the probability student is under 25 and not a male?
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If a patient is selected at random, find these probabilities. A)Patient has had exactly 2 tests done. B) Patient has had at least 2 tests done.C) Patient has had at most 3 tests.D)Patient has had 3 or fewer tests done. E)Patient has had 3 or fewertests?
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Look at table below. Find these probabilites. A.) Exactly 1 item B.) More than 2 items C.) At least 1 item D.) At most 3 items?
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In a box of 24 iPods, 3 are defective. If 3 are sold, find the probability that all are defective. Would you consider this event likely or unlikely to occur?
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A knitted hat pattern comes in 4 styles with 4 stitch options and 3 sizes, and there are 7 yarns appropriate for the hat. Disregarding size, how many different hats can be made?
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How many different 9-0 letter code words can be made using the symbols %, %, %, %, &, &, &, +, +?
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At a fitness center, 64.1% take at least 1 class, 18.6% work with a trainer, 9.2% do both. If a member of the center is selected at random, what's the probability that she does neither?
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Look at table below. What is the probability of choosing a person in California given that they are a male?