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Stoichiometry

Molarity of a HCl Solution

Calculate the molarity of a solution prepared by dissolving 3.12 grams of gaseous HCL in enough water to make 26.8 mL solutions. a. 1.6 M HCL b. 0.8 M HCL c. 3.2M HCL d. 5.4 M HCL

Molar Mass of a Compound from Weight

One molecule of a compound weighs 2.03 E-22 g. Its molar mass is: a. 48 gram per mole b. 92.1 gram per mole c. 114 gram per mole d. 122 gram per mole

Volume of Methane

What volume is occupied by 19.6 gram of methane (CH4) at 27 degree Celsius and 1.59 atm? a. 1.71 L b. 18.9 L c. 27.7 L d. 303 L

Grams in a Solution

How many grams of NaCl are contained in 350 ml of a 0.25 M solution of sodium chloride? a. 41.7 gram b. 5.11 gram c. 14.6 gram d. 87.5 gram

Molality of a mixture of sucrose and water

Suppose we had 1.00 mole of sucrose (it's about 342.3 grams) and proceeded to mix it into some water. It would dissolve and make sugar water. We keep adding water, dissolving and stirring until all the solid was gone. We then made sure that when everything was well-mixed, there was exactly 1.00 liter of solution. What would be t

Groundwater Leading to Environmental Hazards

If solid water were denser than liquid could it cause water pipes to burst - in essence the water pipes underground would burst due to its density and them not being able to withstand to the cold water flow which could contaminatie the groundwater leading to environmental hazards? Or would the opposite be true?

Thermochemistry with Heat of Reactions and Standard Enthalpies

1. (Stoichiometry/Heats of Reactions) a. How many kilojoules of heat energy are released when a 63.4-g sample of magnesium metal is completely converted to magnesium oxide according to the equation below? b. How many grams of oxygen gas are used up during an enthalpy change of -292 kJ? 2 Mg(s) + O2(g) -> 2 MgO(s)

Atomic Weights - The Atomic Mass of N Relative to H

Ammonia is a gas with a characteristic pungent odor. it is sold as a water solution for use in household cleaning. The gas is a compound of nitrogen and hydrogen in the atomic ratio 1:3. A sample of ammonia contains 7.933 g N and 1.712 g H . What is the atomic mass of N relative to H?

Scientific Notations

Am I correct: 1.0 gram = 1,000,000.0 micrograms or 1 x 10^-6 micrograms 1.0 gram = 1,000.0 milligrams or 1 x 10^-3 mg 3.781 micrograms = 3.781 x 10^-6 is this grams? micrograms? Is it 0.000003781 grams ? Is it .003781 mgs or 3.781 x 10^-3 mg? Does this mean that 3

Molar Mass and Formula of Compounds

Determine the formula and molar mass for each of these compounds Sodium Chloride Potassium Bicarbonate Calcium Phosphate Sodium Fluoride Ammonium Hydroxide.

Moles

How many grams are in 1 mole of glucose (C6H12O6) How many individual molecules of sugar are in 1 mole?

Mass to charge ratio

What's the mass to charge ratio? Given: 5.64 x 10(to the)-12 kg/C 1.605 x 10 (to the)-19 C What is the mass of the electron?

Photosynthesis Reaction Questions

1) Photosynthesis is estimated to produce 339.99999 g (dry weight) of plant matter per square meter, 50% of which is carbon. Calculate the total number of grams of carbon "fixed" each year by 1000 square meters. 2) The photosynthetic reaction can be represented as: 6CO2 + 6H2O -> C6H12O6 + 6O2 Of the glucose produced, 40.0%

Volume and final concentration

What would be the steps to solve the following two problems? What volume of 12.0 M HCl is required to make 75.0 mL of 3.50 M HCl? AND What is the final concentration of a solution prepared by diluting 35.0 Ml of 12.0 M HCl to a final volume of 1.20 L?

Concentration of sodium chloeide

What would would the steps to find the concentration of sodium chloride in the final solution if 24.34 mL of 0.113 M BaCl2 completely reacts and the total volume of the reaction is 110.4 mL, give the reaction: BaCl2(aq)+Na2SO4(aq)ds=BaSO4(s)+2NaCl(aq)

Identifying and Classifying Metals

An amateur alchemist claims to have discovered a new metal, which she has named metallium, with the elemental symbol Me. She has carried out an experiment in which a current of 0.500 amps were passed through an aqueous solution of Me(SO4)2 for 45.0 minutes, which deposited 0.682 grams of the metal. Using electrochemistry, show

Lead Nitrate and Sodium Iodide Reactions

Please answer the following parts of a question. 1. What is precipitated in the reaction of lead nitrate and sodium iodide. 2. Explain the reasoning in three sententces. 3. Write a balanced ionic equation for the reaction of lead nitrate and sodium iodide. 4. How, qualitatively, will the value of the solution in water of t

Ionic Equilibria

(See attached file for full problem description) --- 1. When blood is donated, sodium oxalate solution is used to precipitate Ca2+, which triggers clotting. A 104-mL sample of blood contains 9.7à?10-5 Ca2+/mL. A technologist treats the sample w/100.00 mL of .1550 M Na2C2O4. Calculate [Ca2+] after the treatment (Ksp of C

Calculating mass with Q=It

"Calculate the mass of chromium produced in 1.0 hour by the electrolysis of molten CrO3 with an electrical current of 15 A." The answer is 4.85 g, but I'm not entirely sure how to get there. Don't I need the reaction in order to know how many electrons are produced by the electrolysis? I think I first use Q = (I)(t) = (15)

Determining Density from Volume

I have a 40 lb container that measures 14x20x30 and need to find the density. I also have another 40 lb container that has a volume of 1.9 gal. How do you find the density for both to see which one is lighter?

Properties of solutions - Propylene Glycol

9) Calculate the mass of propylene glycol (C3H8O2) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.88 torr at 40 °C. 10) Calculate the freezing point and boiling point of an antifreeze solution that is 50.0 % by mass of ethylene glycol (C2H6O2) in water. 11) Calculate the freezing point and boili

Electrochemistry

3. Nickel is electrolytically refined at 40°C using an electrolyte containing 50 g/liter of nickel ion. The anodes contain copper impurities (< 2 wt.%) which may go into solution as the nickel anode dissolves. Calculate the concentration of Cu2+ ions in solution that is sufficient to result in the deposition of Cu a