77. Three different 25.0 g samples of solid pellets are added to 20.0 mL of water in three different measuring cylinders. The results are sown here. Given the densities of the three metals used, identify the cylinder that contains each sample of solid pellets: A (2.9 g/cm³), B (8.3 g/cm³), and C 3.3 g/cm³). 30 20 (a) 30 20 (b) 30 20 (c)

An acid, HEl, is formed from a hypothetical element, El, and a subsequent aqueous solution is created with the acid and water. The solution is measured to be 22.01% HEl by weight. Calculate the mol % of the acid in the solution.   Atomic Mass: H: 1.00784 g/mol O: 15.999 g/mol El: 160.33996 g/mol   Round your answer to 2 decimal places.

Report your answer to 3 significant figures in scientific notation (example: 1.23E+4) unless stated otherwise. DO NOT include the units in your answer. 1. Consider a reaction of 827 mL of a 6.14×10-2 M K,S04 solution completely reacts with 131 mL of a 3.54x102 M CaI, solution according to the following UNBALANCED chemical equation. K2SO4(aq) + Cal2(aq) → CaSO4(s) + KI(aq) (a) Balance the chemical equation using the lowest integer coefficients. Be sure to include all coefficients including those of 1. 1 K2SO4(aq) + 1 Cal2(aq) 1 CaSO4(s) + 2 KI(aq) You are correct. Your receipt no. is 155-6200 ? Previous Tries (b) Determine the mass (in g) of CaSO4 that is formed in the reaction. Report your answer to 3 significant figures in standard notation (example: 1.23). g Submit Answer Tries 0/99 (c) If 3.58x10-1 g of CaSO4 is produced, what is the percent yield of the reaction? Report your answer to 3 significant figures in standard notation (example: 1.23).

90 80 NH.CI 70 HCI 60 KCI 50 40 NaCI -KCIO, 30 20 NH3 10 10 20 30 40 50 60 70 80 90 100 Temperature (°C) You have a solution containing 50.0 grams of KNO3 dissolved in 100.0 g of water at a temperature of 50.0°C. If you decided to add 20.0 more grams of KNO3, what would happen? O None of the additional 20 grams of solute would dissolve. All of the additional 20 grams would dissolve. Only a few of the 20 additional 20 grams of solute could be dissolved. O A lower temperature would be required to dissolve all 20 of the additional grams of solute Solute per 100g of H

Sample 1 Sample 2 Sample 3 Mass of Erlenmeyer Flask (g) 24.33 24.37 24.44 Mass of Erlenmeyer Flask + Calcium Hydroxide Solution (g)   (g)(lime water) 27.22 27.29 27.33 Mass of Calcium Hydroxide Solution (g) 2.89 2.92 2.89 Volume of Ca(OH)2 Density = 1.000 g/mL 2.89 2.92 2.89 Concentration of HCl (M) 0.1 0.1 0.1 Initial HCl Volume in Syringe (mL) 1.00+1.00 1.00+1.00 1.00+1.00 Final HCl Volume in Syringe (mL) .72 .66 .54 Volume of HCl Delivered (mL) 1.28 1.34 1.46 Moles of HCl Delivered       Moles of OH- in Sample       Moles of Ca2+ in Sample       Molar Solubility (M)       Calculated Ksp       Average Calculated Ksp       I am very confused how to solve the blank spots in the table. Everything including and after "Moles of HCl Delivered" confuses me. Please help me figure out how to solve the sections correctly. Also feel free to…

How many moles of Mg(ClO2)2 are present in 60.0 mL of 1.00 M Mg(ClO2)2 solution?   Note: Answers must be numeric, not alphanumeric—42, not forty-two. Do NOT express your answer in scientific form. KEY is supplied in decimal form only: — XXX.xxxx not X.X x 102

4.  A solution is prepared by taking a clean and dry 50.00 mL volumetric flask.  Some sucrose (Mm 342.2 g/mol) is added to the flask with the following mass measurements recorded: mass of empty volumetric flask:  142.88 g mass of weighing dish + sucrose: 29.83 g mass of weighing dish after adding sucrose to volumetric flask: 24.62 g Some water is added to the flask, the solution stirred until all the sucrose is dissolved.  Then water is added carefully to the mark on the flask.  The filled flask is then weighed again. mass of filled volumetric flask:   187.30 g What is the mole fraction of water?  Answer to 3 decimal places.

Please use the corrrect significant digits (3), if needed use scientific notation.

No ai use okkk

An aqueous solution at 25 °C has a H₂O* concentration of 7. x 10-6 M. Calculate the OH concentration. Be sure your answer has the correct number of significant digits. M 0 10 X G