Room temperature:   294.0 K Barometric pressure:   770.5 mmHg Vapor of water:   18.6 mmHg Volume of O2 collected:   57.90 mL Density of H2O2:   1.01 g/mL % Composition H2O2:   3.02 % Volume of H2O2 used:   5.00 mL Letter of the unknown solution of H2O2:   B Volume of O2 collected for the unknown:   20.20 mL   Calculate the corrected barometric pressure. 752 mmHg I think the o2 pressure is 733.4 Calculate the volume of O2 at STP in mL

Oral rehydration salts are stated to contain the following components: Sodium Chloride  3.5g Potassium Chloride  1.5g Sodium Citrate  2.9g Anhydrous Glucose  20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.

Oral rehydration salts are stated to contain the following components:   Sodium Chloride 3.5g   Potassium Chloride 1.5g   Sodium Citrate 2.9g   Anhydrous Glucose 20.0g   8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were:   Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5.   Atomic weight of Na = 23.   The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??

If 2000 mL/min of air was sampled for 30 min at 18 °C and 103 kPa what is the volume occu pied in liters at temperature of 25 °C and pressure of 1 atm. If 3.2 ng of toluene (C.HSCH3) was collected at 25 °C and pressure of 1 atm, what is the ambient concentration of toluene in ng/L and in ppbv?

calculate the solubility of ca3(po4)2 in water ksp = 2.07 x 10-33

A bloodhound, with an acute sense of smell, sits at one end of a long, unventilated corridor.At the other end of the corridor a small amount of an aerosol is released containing the volatile, fragrant compounds: acetaldehyde (C2H4O) jasmine lactone (C10H16O2) acetoin (C4H8O2) hexyl acetate (C8H16O2) 1-octen-3-one (C8H14O) Rank the compounds in the chronological order they are detected by the hound.       1-octen-3-one       acetoin       jasmine lactone       hexyl acetate       acetaldehyde

What is the solution

1. A 0.68 gram sample of a volatile liquid was heated to 358 K. The gas occupied 265 mL of space at a pressure of 0.95 atm. What is the molecular weight of this gas? PV = nRT and R = 0.082 atmL/moleK. (Make sure that all your units agree/match R)2. An aspirin sample, 0.62 grams, was titrated with 28 mL of 0.105 M NaOH solution. What is the percent purity of this aspirin sample? (MM of Aspirin = 180. g/mol)3. A sample of hydrate was heated thoroughly. How many waters of hydration are there if the anhydrous salt had a dry mass of 12 grams and a molar mass of 185 g/mol? The mass of water evaporated from the hydrate was 5.0 g.4.A sample of water (80 grams) had a temperature change of 6. ℃. What was the heat change of this sample? (q = m c ΔT, c = 4.18 J/ g ℃)5. A 6.0 gram sample of epsom salt, MgSO4 ·nH2O, was heated. After heating, 2.9 grams of anhydrous salt remained. How many waters of hydration does epsom salt contain?6. What is the theoretical yield of aspirin if you started your…

What is the solubility of Ca3(PO4)2 Ksp = 1.3 x 10-32 in a 0.048 M Ca(NO3)2 solution? 5.4 x 10-15M , 1.1 x 10-14 M, 2.6 x 10-16 M, 2.9 x 10-29 M

A student performed the experiment described in this module, using 7.00 mL of a 1.8% H2O2 solution with a density of 1.01 g mL-1. The water temperature was 20 ° C, and the barometric pressure in the laboratory was 30.02 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 45.1 mL of O2.   (11) Calculate the percent error for the experiment.     What is the observed molar volume?