To find out N2 you have to determine the mass of water produced in the reaction. This mass is the difference between the mass of initial compound (BaCl2•XH2O) and the mass of anhydrous salt (BaCl2). N2 is the ratio of the mass of the water produced in the reaction to the molar mass of
Zing Substances. For ionizing substances, such as NaCl , 1mosm is 1mmole times the number of ions formed when each molecule dissociates. One mmole of NaCl is 58 mg, but when it dissociates, it yields 1 mmole of Na+ (23mg) and 1mmole of Cl ( 35mg). Therefore , 58 mg of NaCl is 2 mOsm of NaCl is put into a beaker and distilled water added to make 1 liter, the osmolarity is 2mOsm/l. A) How many mosm solute will 1 gram of NaCl yield?
What is the mass of object 1? __________19.5g_____________________ An object’s volume is the amount of space it takes up. The volume of an irregular object can be measured by how much water it displaces in a graduated cylinder. Place object 1 into the Graduated Cylinder. What is the volume of object 1?
Part B: The graduated pipet’s average density at 22.3 °C was determined to be 0.9785g/mL with a percentage error of 1.89% shows the graduated pipet to be more accurate and precise. Part C: Density of an unknown NaCl solution was measured and a calibration curve used to determine the percentage of NaCl by mass in the solution. y=0.007x + 0.998 which concluded that the concentration of the sodium chloride solution was 3.14%. INTRODUCTION Anything that you can see, touch, taste or smell, occupies space and has mass, it is called matter. Matter can be a gas, a liquid,
For the sulfate anion test, 1 mL of 6M HCl and 1 mL of 0.1M BaCl2 react with 1 mL of the test solution to form a white precipitate product. This indicates the presence of sulfate (SO4¬2-). Sulfate anion equation: H2SO4 (aq) + BaCl2 (aq) → HCl(aq) + BaSO4 (s). The chloride anion test involves mixing 1 mL of the test solution and 1 mL of 0.1M AgNO3. White precipitate shows the presence of chloride (Cl-).
Zero standard: 10 mL of distilled water was poured into a plastic cup labeled 0. This sample will be treated with the color-developing reagent to serve as a zero or blank standard. * * Part II:
A fixed amount of water is added to a graduated cylinder and the volume of water is recorded. The object to be measured is then added to the graduated cylinder and the new volume is recorded. To determine the volume of the object the volume of water is subtracted from the volume of water with the object. Volume – Object = Volume object + water – Volume of water Materials: • Various percentages of zinc and copper mixtures o 0% Cu, 100% Zn o ~10% Cu, ~90% Zn o ~20% Cu, ~80% Zn o ~30% Cu, ~70% Zn o ~40% Cu, ~60% Zn o ~50% Cu, ~50% Zn o ~60% Cu, ~40% Zn o ~70% Cu, ~30% Zn o ~80% Cu, ~20% Zn o ~90% Cu, ~10% Zn o 100%Cu,0%Zn • Pennies o using 5, 10, 20 and 30 pre1982 pennies o using 5, 10, 20 and 30 post1982 pennies Procedure: 1.) From Penny Set A (Pre-1982), measure the mass of 1 penny and then of 2, 3, 5, 7, 9, and 13 pennies.
There will have some error. 2) A volatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. the temperature of the water bath was 100˚C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g. calculate the molar mass of the liquid. T = 273 + 100 = 373 V = 252 mL = 1 L / 1000 mL = 0.252 L P = 776 Torr R= 0.0821 mass of 44.173 - 43.298 g = 0.875g moles of gas = PV / RT = 776 x .252 / 62.363 x (273+100) =0.00841 moles molar mass = 0.875g / 0.00841 moles = 104.1 g/
Percent H2O in Hydrate is equal 0.34/2.33=14.6% 3. The general formula of barium chloride hydrate is BaClg-nHZO, where n is the number of water molecules. Calculate the theoretical percent water for each value of n—divide the sum of the atomic masses due to the water molecules by the sum of all the atomic masses in the hydrate, and multiply the result by 100. Complete the table. | BaCl2 | BaCl2•H2O | BaCl2•2H2O | BaCl•3H2O | Sum of atomic masses (BaCl2) | 208.23 | 208.23 | 208.23 | 208.23 | Sum of atomic masses (nH2O) | 0 | 18.02 | 36.04 | 54.06 | Sum of atomic masses (hydrate) | 208.23 | 226.25 | 244.27 | 262.29 | Percent water in hydrate (theoretical) | 0% | 7.96% | 14.75% | 20.61% | In this lab we used a Balance, centigram
Fully simplify the expression, tanx1+ tan2x . Use the knowledge that sin x= -35 and π2≤x ≤ 3π2 to express your simplified expression as an exact answer in fraction form. 4 Heat loss from electric hot water systems is an environmental issue. It is recognised that the heat loss from a closed, full hot water tank is proportional to the surface area of the tank. Determine the ratio of the heat loss from a 1m3 cylindrical tank of optimum dimensions (that is, the dimensions of the cylindrical tank for which the heat loss is a minimum) to the heat loss from a cubic tank with the same volume.