(ii) A sample of 3.25 cm³ of bromine vapour leaks into a laboratory. Calculate the minimum volume, in dm³, of the laboratory for the resulting concentration of bromine to be at a safe level.
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- what is the mole fraction of 4.31 m KBr (aq)?At sea level, there are approximately 2.6 × 1025 molecules m–3 of the atmosphere. There are 1.17 × 1022 molecules m–3 of one of the gases making up the atmosphere. What is the concentration of this gas as a proportion of the total number of molecules in the atmosphere, expressed in parts per million (ppm)?3.8801 g of zinc metal was dissolved in dilute sulphuric acid and then made up to 381 cm3 with water. What is the percentage mass in volume composition in terms of zinc sulphate (ZnSO4.7H2O).
- What volume (in mL) of 3.20 M HNO3(aq) needs to be added to excess Na,CO3(s) to generate 4.85 L CO2(g) at standard temperature and pressure (STP)? Provide your answer in decimal notation rounded to the appropriate number of significant figures.Write the formula for a micelle of a sol of barium sulfate, obtained by the exchange reaction between barium nitrate and potassium sulfate in the case of an excess of barium nitrate.A volume of 125.0 mL of 0.565 M KOH (aq) is diluted with 425.0 mL of pure water. What is the final concentration (in molarity) of KOH? Report to three significant figures.
- 7. A technician is setting up a laboratory to standardise ~0.0200 mol dm–3 KMnO4. What mass of Mohr’s salt [FeSO4(NH4)2SO4·6H2O] would the technician be required to weigh out to produce a 5.00 L solution of Mohr’s salt such that 25.0 cm3 aliquots of the salt would require a titre of 20.0 cm3 to standardise the KMnO4 solution?In addition to filling in the blanks below, show all of your work for this problem on paper for later upload. K for the reaction SbCls(g) z SÜC];(g) + Cl2(g) is 2.50 x 10 2 at 248 °C. 2.00 mol of S6CI3 and 1.00 mol of Cl, is introduced into a 4.00 L bulb at 248 °C. What are the concentrations of all three species once equilibrium is established? Enter your value for [SBCI5] in the first box and an appropriate unit of measure in the second box. Enter your value for [SBCI3] in the first box and an appropriate unit of measure in the second box. Enter your value for [Cl,] in the first box and an appropriate unit of measure in the second box. A/Great Lakes Chemical Company produces bromine, Br2, from bromide salts, such as NaBr, in Arkansas brine by treating the brine with chlorine gas. Write a balanced equation for the reaction of NaBr with Cl2. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.)
- The atmosphere contains about 5.2×10^15 t of air. What mass in metric tons of carbon dioxide is in the atmosphere if the concentration of CO2 is 392 ppm?I need some assistance.In Module #4, we discussed the role of chlorofluorocarbons (CFCs) in catalyzing the destruction of O3 in the stratosphere. One example of a CFC that is known to exasperate formation of the hole in the O3 layer is dichlorodifluoromethane (CF2Cl2). In the year 2000, this chemical reached its peak concentration of 2.2 x 10-11 M in the atmosphere. The destruction of CF2Cl2 can be approximated as a first-order process and the 1996 treaty on CFC emissions has eliminated its release into the atmosphere. Given that the rate constant for destruction of CF2Cl2 in the atmosphere is 0.009 yr-1, how long will it take for the concentration of CF2Cl2 to decline to 0.22 x 10-11 M?
