Please please. I have to do 45 questions for chemistry home work. And i'm stuck on these. Please does anyone know how to solve any of these? abeg help me.
2. What NaCl concentration results when 284 mL of a 0.800 M NaCl solution is mixed with 672 mL of a 0.410 M NaCl solution?
4. 52.0 mL of a 1.80 M solution is diluted to a total volume of 248 mL. A 124-mL. A 124-mL portion of that solution is diluted by adding 174 mL of water. What is the final concentration? Assume the volume is addictive.
10. What is the pH of an aqueous solution with a hydrogen ion concentration of [H^+] = 2.5 x 10^-4 M?
12a. if a solution containing 95.415 g of mercury(ii) acetate is allowed to react completely with a solution containing 15.488 g of sodium sulfide, how many grams of solid precipitate will be formed?
b. How many grams of the reactant in excess will remain after the reaction?
13. Complete combustion of 4.20 g of a carbon produced 12.9 g of CO2 and 6.15 g of H20. What is the empirical formula for the hydrocarbon?
14. Calculate the molarity of the following
a. 0.300 mol of Na2S in 1.45 L of solution.
b. 20.5 g of MgS in 985 mL of solution.
16. Assuming an efficiency of 45.10%, calculate the actual yield of magnesium nitrate formed from 124.5 g of magnesium and excess copper(ii) nitrate.
Mg Cu(NO3)2 >--- Mg(NO3)2 Cu
