Calculate the molalities of some commercial reagents from the following data:
Calculate the molalities of some commercial reagents from the following data: (Assume 100 g of solution.) Data HCl(aq) NH3(aq) Formula weight (g/mol) 36.465 17.03 Density of solution (g/mL) 1.19 0.90 Weight % 30.2 26.4 Molarity 11.3 14.4 Molality of HCl(aq) Molality of NH3(aq)
3 attempts left Check my work Be sure to answer all parts. Calculate the molalities of the following aqueous solutions: (a) 127 M sugar (CiHOn) solution (density of solution 1.12 g/mL) 1.85 (b) 0.829 M NaOH solution (density of solution 1.04 g/mL (c) 5.21 M NaHCO solution (density of solution 1.19 g/mL) 2 3 4
Identify reagents by letter from the reagents table for each step in the following scheme. Some steps may require more than one reagent. Enter the first reagent on the left. Reagents Br_2 CH_3I CH_3CH_2I CH_3CH_2CH_2Br_2 CH_2I_2/Zn(Cu)/ether H_2/Lindlar catalyst H_2O/H_2SO_4/HgSO_4 1. BH_3 in THF 2. H_2O_2 in NaOH 1. O_3 2. Zn/H_3O^+ Li in NH_3 KOh/ethanol NaNH_2/NH_3 Step 1: Step 2: Step 3:
In each reaction box, place the best reagent and conditions from the list below. (Some reagents may be used more than once) In each reaction box, place the best reagent and conditions from the list below. (Some reagents may be used more than once.)
Choose the most appropriate reagents and conditions to prepare the following compounds from the corresponding starting materials. More than one option is possible in some cases. PROBLEM 1. Reagents. Choose the most appropriate reagents and conditions to prepare th following compounds from the corresponding starting materials. More than one option is possible in some cases, but you only need to indicate one! Ok
Calculate the number of grams/serving of sugars in the commercial beverage (Root Beer from the procedures) as measured with the experimental data provided. Hint: You will need the serving size volume from the can (pictured in procedures) as well as to use your percent concentration of Root Beer found from standard curve in #3 to solve this. volume=355 mL approx. concentration of root beer=12.5% sucrose
In each reaction box, place the best reagent and conditions from the list below. (Some reagents may be used more than once.)
In each reaction box, place the best reagent and conditions from the list below. (Some reagents may be used more than once.)
1. Provide the necessary reagents to carry out the following transformations; some transformations may require more than one step. 1. Provide the necessary reagents to carry out the following transformations; some transformations may require more than one step. (3pts) NO2 Br Br NH2 NO2 NO2
Electrochemistry 1.Consider the Daniel Cell at the indicated molalities: Zn(s)|ZnSO4(aq, 0.100 M)||CuSO4(aq, 0.500 M)|Cu(s) a) Calculate the ionic strength I and mean activity coefficient (gamma+-) for each species, the latter using the Debye - Hückel limiting law, and compare this value to those found in the data tables (i.e., (gamma +-),ZnSO4 = 0.150 at 0.100 M; (gamma +-),CuSO4 = 0.0620 at 0.500 M). b) Calculate E using the molalities indicated in the above Cell...