3 Ca(NO3)2(aq) + 2 NazPO,(aq) → Ca3(PO,)2(s) + 6 NaNO3(aq) (a) the moles Ca3(PO4)2 produced from 4.3 mol Na3PO4 mol Ca3(PO4)2 the tolerance is +/-2% (b) the moles NaNO3 produced from 0.89 mol Ca(NO3)2 mol NaNO3 the tolerance is +/-2% (c) the moles Na3PO4 required to react with 1.65 L of 0.382 M Ca(NO3)2 mol Na3PO4 the tolerance is +/-2%
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- Mn04 (aq) + SH"(aq) + 5e → Mn2"(aq) + 4H201) Cry0,2 (ag) + 6e → 2Cr*(aq) + 7H2O0) Cu2" +1.51 V +1.33 V *(aq)+2e Cu(s) (aq) + 2e Pb(s) (aq) + 2e→ Fe(s) +0.34 V -0.13 V Fe2+ Al3*(aq) + 3e → AI(3) -0.44 V -1.66 V Refer to Exhibit 17-1. Determine E cell for the electrochemical cell designated by the cell notation below. Al(3) | Al3* (ag) || Cu2*(aq) | Cu(s) O a. +12.0 V O b.+5.66 V Oc.-2.00 V O d.-1.32 V O e. +2.00 V(a) I2(s) + 5 Cu²* (aq) + 6 H2O(1) (b) Hg²*(aq) + 2 1 (aq) (c) H2SO3(aq) + 2 Mn(s) + 4 H*(aq) 2 103 (aq) + 5 Cu(s) + 12 H*(aq) - ·Hg(l) + I2(s) - S(s) + 2 Mn²* (aq) + 3 H2O(I)1. (a) A solution of NaCl is prepared by dissolving 0.0056 g NaCl with enough H2O in a volumetric flask to yield a final volume of 10 mL. Assuming a standard (0.1 mg) analytical balance and class A glassware is employed, calculate the concentration of the solution (M) and its corresponding error. The atomic weights of Na and Cl are 22.98976928(2) and 34.45(1), respectively (the number in parentheses indicating the error in the last digit). (b) What would the error be if a 1mL transfer pipet was employed (10x) rather than the 10 mL volumetric flask?
- In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm-1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)The air in a recently used classroom 9m x 7m x 9m tested 0.12% carbon dioxide. How many cubic meters of fresh air must be admitted per minute in order that 10 minutes later it shall contain not over 0.06% carbon dioxide. Fresh air contains 0.04% carbon dioxide. Assumeimmediate mixing of fresh with stale air. (A) 14 (B) 11 (C) 15 (D) 19 (E) 174A1+30₂ → 2 A/₂ 03 How much aluminum would be needed to completely reach with 45gm of 0₂? (a) 1.875 moles 3.75 moles 105 moles 1 1.875 grams.
- An excess of 0.34 mg Pb is obtained from an assay test determined in an analysis. What is the percent relative error in ppt if the mass of the sample is 550 g?2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?The physical fitness of athletes is measured by “VO2 max,”which is the maximum volume of oxygen consumed by anindividual during incremental exercise (for example, on atreadmill). An average male has a VO2 max of 45 mL O2>kgbody mass/min, but a world-class male athlete can have a VO2max reading of 88.0 mL O2>kg body mass/min. (a) Calculatethe volume of oxygen, in mL, consumed in 1 hr by an averageman who weighs 185 lbs and has a VO2 max reading of 47.5mL O2>kg body mass/min. (b) If this man lost 20 lb, exercised,and increased his VO2 max to 65.0 mL O2>kg body mass/min,how many mL of oxygen would he consume in 1 hr?
- Na2CO3 (aq) + CaCl2 (aq) —> CaCO3 (s) +2NaCl (aq) Mass of Na2CO3 =1.118g Mass of CaCl2= 1.381g Mass of precipitate obtained from the experiment =0.9591g 1) what is the mass of excess reagent left unreacted 2) calculate the theoretical yield(in grams) and the percent yield of the experiment.(a) What is the concentration of hydrogen at the B face in kilograms of H per cubic meter? C'H(B) = i kg/m³ (b) What is the concentration of hydrogen at the A face in kilograms of H per cubic meter? C'H(A) = kg/m³ iKHC3H4O4 (aq) + NaOH (aq) - KNaCgH404 (aq) + H20 (1) KHP is the abbreviation for KHC3H404 and its molar mass is 204.2 grams/mol What is the percentage (%) of KHP in an impure sample of KHP that weighs 0.4200g and requires 14.00mL of 0.098 M NaOH to neutralize it? O 66.71 O 73.39 52.89 O 85.12