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- Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. This property is one reason why authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po decay into after it emits an alpha particle?Compound A contains 63.68% C, 9.8% H, 12.38% N and the rest is O by mass. The empirical formula for compound A is? O a. C₂H₁1 NO3 O b. С₂H₁₁NO O c. none of these O d. C6H11NO2Use the following balanced equation for problems 1–5. Molar masses are given below. 2 As 3 H2 2 AsH3 150. kcal + + molar masses 74.92 g 2.02 g 77.95 g How many moles of hydrogen are required to react with 25.00 moles of arsenic, As ? A. 75.00 mol B. 25.00 mol C. 16.67 mol D. 37.50 mol
- 2. A. If 100 mls of 0.03 M HCI is added to 400 mls of 0.5 M glycine buffer at pH 10.4, what is the resultant pH? (pK1 for Gly= 2.2, Pk2=9.4) Gly.4L X.5mol/L= .2 mol HCI.1LX.03mol/L = .003mol Glyº .02mol +.003 mol .023mol [HA] = .023/.5L =.046M, [A-] =.177/.5L = .354M pH = pka +log [A-]/[HA] pH = 9.4 +log.354/.046 = 10.3 [HCI] = [H+] = .003mol/.5L = .006M pH =2.2 Gly + H+ .18mol -.003mol .177mol end start B. What would the pH be if the same amount of HCl as in part A was added to 400 mls of water?The concentration of alcohol 1CH3CH2OH2 in blood, calledthe “blood alcohol concentration” or BAC, is given in unitsof grams of alcohol per 100 mL of blood. The legal definitionof intoxication, in many states of the United States, is that theBAC is 0.08 or higher. What is the concentration of alcohol,in terms of molarity, in blood if the BAC is 0.08?The molecular weight of ethanol (CH3CH2OH) is46 and its density is 0.789 g/cm3.A. What is the molarity of ethanol in beer that is 5%ethanol by volume? [Alcohol content of beer varies fromabout 4% (lite beer) to 8% (stout beer).]B. The legal limit for a driver’s blood alcohol contentvaries, but 80 mg of ethanol per 100 mL of blood (usuallyreferred to as a blood alcohol level of 0.08) is typical. Whatis the molarity of ethanol in a person at this legal limit?C. How many 12-oz (355-mL) bottles of 5% beer coulda 70-kg person drink and remain under the legal limit? A70-kg person contains about 40 liters of water. Ignore themetabolism of ethanol, and assume that the water contentof the person remains constant.
- The pH of a 1.25 x10-3 M NaOH solution is: a 7 2,90 3.10 d 11.10 O e 10.90How many grams of calcium chloride (CaCl2; molecular weight = 111 g mole−1) would you dissolve in water to make a 0.111 M CaCl2 solution with 1 L final volume? g7. If the concentration of Mg²* in water is 36.6mg/L, what is the hardness of the water as mg/L CACO3? (atomic weight: 24.2 for Mg, 12 for C, 16 for O, and 40 for Ca)
- Find the Gibbs free energy of mixing when 2 moles of ethanol is mixed with 5 moles of water at a temperature of 27 °C. The pressure of the system is kept constant. The two liquids form an ideal solution. O A. -10.45 J O B. 10.45 kJ O C. -11.75 kJ O D. 11.75 kI O E. -10.45 kJThe content of calcium in Al-Jabal Al-Akhdar bottled drinking water is 7.9 mg per liter. How many moles of calcium ions are in 330 mL of this water? O a. 0.065 mol O b. 6.5x10-5 mol O c. 3.9 x10-19 mol O d. 2.0x10-4 mol O e. 0.20 molHow many oxygen atoms are in this molecular formula? 3H2 O