What is the molarity when water is added to three moles of sodium chloride to make .5 L of solution ?
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What is the molarity when water is added to three moles of sodium chloride to make .5 L of solution ?
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- 75 mL of oxygen gas at a temperature of 70 degrees Celsius expands to 97 mL upon heating. What is the new temperature in degrees Celsius? Use 273 for the conversion of Celsius to Kelvin.A container of gas holds 1.04 moles of neon gas. If the volume of the container is 10.1 liters and the pressure inside is 2.4 atm, what is the temperature (in K) of the gas?A sample of pure sodium has a mass of 17.4 g. Calculate the number of moles in the sample and sodium atoms in the sample. HINT (a) moles in the sample moles (b) sodium atoms in the sample atoms
- Problem 1: Answer the following questions using the table to the right. Medium Gases at 0 °C, 1 atm Air Carbon dioxide Hydrogen Oxygen 1.000293 1.00045 1.000139 1.000271 Liquids at 20 °C Benzene Carbon disulfide Carbon tetrachloride Ethanol Glycerine Water, fresh 1.501 1.628 1.461 1.361 1.473 1.333 Solids at 20 °C Diamond Fluorite Glass, crown 2.419 1.434 1.52 Glass, flint |Ice (at 0 °C) Polystyrene Plexiglas Quartz, crystalline Quartz, fused Sodium chloride 1.66 1.309 1.49 1.51 1.544 1.458 1.544 Zircon 1.923 Part (a) Calculate the index of refraction for a medium in which the speed of light is 2.012 × 10°. Numeric : Anumeric value is expected and not an expression. Part (b) Determine the most likely identity of the substance based on the table in the problem statement. MultipleChoice : 1) Carbon tetrachloride 2) Diamond 3) Ethanol Sodium chloride 5) Plexiglass 6) Water, fresh 7) Glycerine 8) Polystyrene 9) Glass, crown 10) Glass, flintJanice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…A sample of pure sodium has a mass of 15.7 g. Calculate the number of moles in the sample and sodium atoms in the sample. HINT (a) moles in the sample moles (b) sodium atoms in the sample atoms
- Hemoglobin has a molecular mass of 64 500 u. Find the mass (in kg) of 273 molecules of hemoglobin. Number MO UnitsThe sample in an experiment is initially at 80°C. If the sample's temperature is doubled, what is the new temperature in °C? Express your answer in degrees Celsius.The normal body temperature is 37 ° C. What is this reading in a) °F b) K