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1. Bromine can be obtained from the decomposition of calcium bromide by means of electrolysis. If 10.0 g of calcium bromide are dissolved in water before electrolysis and if 1.75 L of gaseous bromine is produced at 70 °C and 80 kPa, what is the theoretical yield percentage?
CaBr2 à Ca + Br2
2. Calculate the number of moles of gaseous nitrogen contained in a sample of 227 mL of gas saturated with water vapour at 20 °C and 90.0 kPa.
Hint: Find the volume of pure hydrogen then convert this volume to NTP conditions and find the number of moles. (The change in pressure applies to the pressure exerted on the gas; it'll vary between 90 kPa and 101.3 kPa even if the partial pressure of the nitrogen is less than 90 kPa.)
3. Calculate the pressure exerted by the oxygen only.
Note: When a gas collects at the surface of the water, assume it is saturated with water vapour
4. What's the volume of pure hydrogen present in a sample of 55.0 mL of gas saturated with water vapour at 27 °C, if the total pressure is 104.8 kPa?
A student wants to conduct an experiment requiring 500 ml of a 3 M sulfuric acid 18 M concentrated sulfuric acid is available. How could the student prepare the desired solution
Using the following reaction: OH- + HC2H3O2 ---> H2O + C2H3O2- a 75.0 mL sample of potassium hydroxide, KOH, of unknown concentration is titrated with 42.5 mL of 0.575 M acetic acid.
Problem- The carbon - 14 decay rate of a sample obtained from a young tree is 0.262 disintegration per second per gram of the sample. Another wood sample gives a decay rate of 0.180 disgeneration per second per gram of the sample. What is the age ..
suppose a 500 ml solution contains 1.00 mmol of co(no3)2, 100 mmol of NH3, and 100 mmol of ethylenediamine. what is the concentration of co2+ in the solution?
a mixture of three gases has a total of 756 mm Hg. If the pressure of nitrogen is 612 mm Hg and the pressure oxygen if 100 mm Hg, what is the pressure of the carbon dioxide gas in the mixture?
If a reaction vessel initially contains only CO and NH3 at concentrations of 1.00 Mand 2.00 M, respectively, what will the concentration of HCONH2 be at equilibrium
Determine the required CSTR volume, V (in gallons), and hydraulic residence time, in V/Q (hours), to comply with the current industrial pretreatment permit limitation for phenol
A 2+ ion of a particular element has an atomic mass of 203 and 123 neutrons in its nucleus, a) what is the nuclear charge in this element. Why? b) what are the symbol and name of this element? How do you know?
Calculate the amount of heat required to completely sublime 51.0 g of solid dry ice (CO_2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol .
a container has a mass of 78.91 grams when empty and 92.44 g when filled with water. the density of water is 1.000
A 195mg sample of a non-electrolyte isolated from throat lozenges was dissolved in enough water to make 10.0mL of solution at 25 degrees Celsius. The osmotic pressure of the resulting solution was 4.83atm. Calculate the molar mass of the compound.
The standard reduction potential for the reduction of Eu3+(aq) to Eu2+(aq) is -0.43V. Which of the following substances is capable of reducing Eu3+(aq) to Eu2+(aq) under standard conditions
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