value: 0.76 points 1 out of 3 atte Enter your answer in the provided box. Determine...
will give thumbs up! 3 attempts left Check my work Enter your answer in the provided box. points Water is added to 75.0 mL of a 0.992 M KNO, solution until the volume of the solution is exactly 250 mL. What is the concentration of the final solution? eBook Print References 3 attempts left Check my work Enter your answer in the provided box. points A volume of 54.2 mL of a 0.468 M Ca(NO) solution is mixed with 75.5...
5.00 points 5 atempts let Check my work Enter your answer in the provided box. A quantity of 2.30 x 102 mL of 0.650 M HNO, is mixed with 2.30 x 10 mL of 0.325 M Ba(OH), in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46°C. The heat of neutralization when 1.00 mol of HNOj reacts with 0.500 mol Ba(OH) is-56.2 kJ/mol. Assume that the densities and specific heats of...
connect CHEMISTRY KQuestion value: 0.55 points 3 out of 5 atte Enter your answer in the provided box. Calculate AH rn for the following: SiO2(s) + 4 HF(g)-→ SiF4(g )-2H20(1) AH,-[SiO2 (s)--910.9 kJ/mol SH, [HF (g )]=-273 kJ/mol ΔΗ/[H2O (1)]--285.840 kJ/mol 3084 6 kJ References Book & Resources
1 out of 3 attempts Enter your answer in the provided box. The standard enthalpy ehange AH for the thermal decomposition of silver nitrate according v to the following equation is 78.67 kJ The standard enthalpy of formation of AgNO,(s) is-123.02 kJ/mol. Caleulate the standard enthalpy of formation of AgNO,(s) kJ/mol MacBook Air esc F5 4 tab
Enter your answer in the provided box. Calculate the mass of calcium nitrate in each milliliter of a solution prepared by diluting 64.5 ml of 0.920 M calelum nitrate to a final volume of 0.186 L.
3. value 10.00 points 1 out of 3 attempts Enter your answer in the provided box. Find the pH of a buffer that consists of 0.37 M NH3 and 0.12 M NH4CI (pKb of NH3 -4.75)
Enter your answer in the provided box. The concentration of lead ions (Pb2) in a sample of polluted water that also contains nitrate ions (NO3 ) is determined by adding solid sodium sulfate (Na2SO4) to exactly 500 mL of the water. Calculate the molar concentration of Pb2* if 0.00275 g of NazSO4 was needed for the complete precipitation of lead ions as Pbso4 Enter your answer in the provided box. The concentration of lead ions (Pb2) in a sample of...
Enter your answer in the provided box. If 27.9 mL of silver nitrate solution reacts with excess potassium chloride solution to yield 0.455 g of precipitate, what is the molarity of silver ion in the original solution? M
value 1.00 points 1 attempts left Check my work Enter your answer in the provided box. A buffer solution is prepared in such a way that the concentration of propanoic acid is 1.92 x 10 Mand the concentration of sodium propanoate is 1.51 x 10° M. If the buffer equilibrium is described by CH3COOH(aq) + H20(1) = H2O*(aq) + CH3C00 (aq) Gul propanoic acid propanoate ion with K = 1.34 x 105 calculate the pH of the solution. pH =...
WILL GIVE THUMBS UP 3 attempts left Check my work Enter your answer in the provided box. points A sample of 0.5760 g of an unknown compound containing barium ions (Ba) is dissolved in water and treated with an excess of Na,C0y. If the mass of the BaCO, precipitate formed is 0.5343 . what is the percent by mass of Ba in the original unknown compound? ebook Print References 3 attempts left Check my work Enter your answer in the...