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- is the A:B ratio just a place holder for the unknown compound can you use other variables in place of "A and B" also would H2O work as another formula instead of Na2OProblem Specialized cells in the stomach release HCl to aid digestion. If they release too much, the excess can be neutralized with an antacid. A common antacid contains magnesium hydroxide, which reacts with the acid to form water and magnesium chloride solution. As a government chemist testing commercial antacids, you use 0.10 M HCl to simulate the acid concentration in the stomach. How many liters of “stomach acid” reactwith a tablet containing 0.10 g of magnesium hydroxide?Plan We are given the mass (0.10 g) of magnesium hydroxide, Mg(OH)2, that reacts with the acid. We also know the acid concentration (0.10 M) and must find the acid volume. After writing the balanced equation, we convert the mass (g) of Mg(OH)2 to amount (mol) and use the molar ratio to find the amount (mol) of HCl that reacts with it. Then, we use the molarity of HCl to find the volume (L) that contains this amount (see the road map).Answer to a Is 69.46 kJ/mol Answer to b is -166.3 kj/mol
- In a survey of 1000 large corporations, 250 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job (USA Today).(a) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p.(b) Find a 0.95 confidence interval for p.(c) As a news writer, how would you report the survey results regarding the proportion of corporations that hire the equally qualified nonsmoker? What is the margin of error based on a 95% confidence interval?Show work using conversion factors Answer Key: #35g 272.30 g CaSO4 #35h 1.23 moles H2SO4 #35i 1.85 moles H2SO4 #35j 0.00836 moles of Ca3(PO4)2 molecules #35k 1.3333 moles H3PO4 (answer corrected 10/9/19) #35l 130.67 g H3PO4 (answer corrected 10/9/19)To determine the mass of Fe2O3 from the given mass of K3Fe(CN)6, the gravimetric factor to be used is a. Fe2O3 / K3Fe(CN)6 b. Fe2O3 / 2K3Fe(CN)6 c. 2Fe2O3 / K3Fe(CN)6 d. 3Fe2O3 / 2K3Fe(CN)6
- ZnSO4 + Cu → MgSO4 + Cu → FeCl3 + Cu → AgNO3 + Cu → HCl + Cu → CuSO4 + Zn → MgSO4 + Zn → FeCl3 + Zn → HCl + Zn → CuSO4 + Mg → ZnSO4 + Mg → FeCl3 + Mg → AgNO3 + Mg → HCl + Mg → show all workMass of Empty Beaker is 141.2g, Beaker + Water is 388.3g, mass of water is 247.1g, volume of water is 0.2471mL, calculate volume H2=volume displaced water, calculate moles H2 evolved(equation 6), Calculate Nh2 moles of H2, per gram of sample, calculate % Al from graph in problem 1, calculate Al from equation 5.Deionized water is added to a 138.0 mL sample of 1.103 M oxalic acid to dilute it to 0.436 M. What volume of water, in mL, was added to dilute the sample? Round answer to correct sig figs.
- answer is 0.72. how is it arrived at? please show detailed steps and calculation.1.A student masses an unknown hydrate sample and finds there are 5.00g of hydrate. After dehydrating the sample in an oven for 1h, the sample has a mass of 3.00 g. How many moles of water were removed from the hydrate. use dimensional analysis. 2. a. What is the mass of anhydride for the student sample? ___________ g anhydride b. If the formula weight (molar mass) of the anhydride is 89.54g/mol, how many moles of anhydride are in the student sample? c. What is the ratio of moles of water to moles of anhydride? mol H2O . = _____________ mol anhydride d. What is the formula for the hydrate? Fill in the blank: X • ___ H2OCalculate deltaH1 Please provide 3 sig figs, units are KJ/mol, please only give number value in answer. Mg(s) + 1/2O2(g) --> MgO(s) deltaH1 = ? Mg(s) + 2H+(aq) --> Mg2+(aq) + H2(g) deltaH2 = +10.1 kJ/mol MgO(s) + 2H+(aq) --> Mg2+(aq) + H2O(l) deltaH3 = -5.00 kJ/mol 1/2O2(g) + H2(g) --> H2O(l) deltaH4 = -286.0 KJ/mol