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If I have 0.75 moles of a gas at a pressure of 646 mm Hg and a volume
of 0.95 liters, what is the temperature?
what is electrolysis?
A sample of gas occupies 175mL at 10.0C. What volume in mL will the gas have at 20.0C and 750mm Hg?
1.
a) What is the pH of a solution if it's oxonium ion concentration is 0.0025 mol/l ?
b) The pH of the solution is 10.4. Is the solution acidic or alkaline? What is the hydroxide ion concentration of the solution?
c) Determine the pH of the 0.035 molar potassium hydroxide solution.
A 0.674\,\text M
0.674M
0, point, 674, start text, M, end text
cobalt(II) chloride (\text{CoCl}_2
CoCl2
start text, C, o, C, l, end text, start subscript, 2, end subscript
) solution is prepared with a total volume of 0.0750\,\text{L}
0.0750L
0, point, 0750, start text, L, end text
. The molecular weight of \text{CoCl}_2
CoCl2
start text, C, o, C, l, end text, start subscript, 2, end subscript
is 128.9\,\dfrac{\text{g}}{\text{mol}}
128.9mol
g
128, point, 9, start fraction, start text, g, end text, divided by, start text, m, o, l, end text, end fraction
.
What mass of \text{CoCl}_2
CoCl2
start text, C, o, C, l, end text, start subscript, 2, end subscript
(in grams) is needed for the solution?
Express the answer using 3 significant figures.
What are the advanced energy technologies?
A student transferred 20ml of water into a conical flask by using a pipette. However later it was found out that the conical flask contained only 19.1ml of water. What 2 factors could have caused this to happen
A solution contains 68.4 g of sucrose (C12H22O11) dissolved in 250 g of water. What
is the molality of the solution?
80.0g of propanone was heated from 25.50C to 63.40C. How much energy was transferred to the propanone during heating? Specific heat of propanone is 2.13Jg-1 oC-1?
A stone weighing 2.0g absorbs 5.0J of heat and warms by 3.00C. What is the specific heat capacity of the stone?
