How many grams of Na2SO4 (142.04 g/mol) are needed to prepare 125.0 mL of 2.50 mM solution of Na+? What's the concentration in ppm of Na+ in this solution?
How many grams of Na2SO4 (142.04 g/mol) are needed to prepare 125.0 mL of 2.50 mM...
A) How many grams of solute are needed to prepare 2.50 × 102 mL of 0.145 M CuSO4? B) A sample of crude oil contains 3.03 mM naphthalene, 11.8 mM methylnaphthalene, 24.4 mM dimethylnaphthalene, and 14.6 mMtrimethylnaphthalene. What is the total number of moles of all naphthalene compounds combined in 100.0 mL of the oil?
How many grams of KCN (Mm = 65.1 g/mol) must be added to 900. mL of 1.240-M solution of HCN in order to prepare a pH = 8.86 buffer?
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to make 200.0 mL of solution. Calculate the molarity of magnesium chloride solution. A. 0.04070 M B. 2.03510-4 M C. 0.2035 M D. 0.3242 M E. 8.14010-3 M 2. How many grams of Na2SO4 (MM 142.04 g/mol) are in 250. mL of a solution that has a concentration of 0.115 M? A. 4.08 g B. 2.02 g C. 6.25 g D. 1.14 g E. 3.07...
How many grams of KC2H3O2 are needed to prepare 2.27 L of 0.290M KC2H3O2 solution? (MM KC2H3O2 = 98.14 g/mol) show your work and round your answer to the correct number of sig figs
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 750. mL of 1.188-M solution of NH3 in order to prepare a pH = 9.90 buffer?
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 750. mL of 0.928-M solution of NH3 in order to prepare a pH = 8.95 buffer?
How many grams CuSO4∙5H2O (MM = 249.685 g/mol) are there in a 100 mL solution if an electrode weighed 7.9045 g initially and 8.2532 g after copper metal was electroplated onto it from the solution?
How many grams of Na3PO4 (MW = 164 g/mol) are needed to make 282.3 mL of solution that is 0.200 M sodium?
How many grams of K CO, (MM - 138.21 g/mol)are needed to completely react with 453.2 ml of 0.525 M HBr? 2 HBr(aq) + K,CO,() - 2 KBr(aq) + CO2(g) + H20(1)
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 550. mL of 0.976-M solution of NH3 in order to prepare a pH = 9.15 buffer? What volume (to the nearest 0.1 mL) of 4.00-M NaOH must be added to 0.600 L of 0.300-M HNO2 to prepare a pH = 3.50 buffer?