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The Dumas method is used to determine the molecular weight of a volatile liquid (M = mRT/PV;
R = 0.0821 L atm mol-1 K-1. The liquid weighs 0.68 g at 1.00 atm and 25°C. It occupies 277 mL. The liquid is
a. acetone (molecular weight = 58.1 g/mol)
b. ethanol (molecular weight = 46.1 g/mol)
c. ethyl acetate (molecular weight = 88.1 g/mol)
d. isopropyl alcohol (molecular weight = 60.1 g/mol)
We did a lab in Chem where we put a liquid into a flask, secured foil on the top and poked a hole in the foil so the vapor could push out the air
You need to dissolve CaCl2 in water to make a mixture that is 38.0% calcium chloride by mass. If the total mass of the mixture is 681.2 g, what masses of CaCl2 and water should be used
1. why should the funnel be removed from the top of the burette while titration is being berformed?2. while the
The calibration points for the Martian temperature scale are the usual melting point of ice and boiling point of water, which are assigned the values 0 °M and 80 °M. the normal body temperature of humans is 98.6 °F. What is this temperature in °M?
Calculate the number of moles of sodium bicarbonate orginally present in the unknown mixture, knowing that 20.0ml of 0.100M HCL were used in the step 2 of titration, using methyl orange as an indicator.
The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?
Which of the following terms would be used in a description of the mechanism of this reaction? tertiary carbanion, 2-methylpentoxonium ion, sp hybridized pentyne, vicinal dihydroxide, or hydroxide ion.
Determine the pH of a solution of 10-3 M sodium formate. (Formate is a byproduct of microbial metabolism, and can also serve as an energy source for anaerobic bacteria.
Some 2-methyl-2-butene may be produced in the reaction as a by-product. Give a mechanism for its production.
the heat capacity for a bomb calorimeter is 10.30kjdegreec.calculate the heat of combustion of one gram of almond
Hydrochloric acid reacts with zinc metal to form zinc chloride and hydrogen gas. If 345.2 g of zinc metal reacts with 231.6 grams of acid. How many liters of hydrogen gas are produced? How many moles of zinc chloride are produced?
what is the wavelength of the line in the Balmer series of hydrogen corresponding to the transition for n=5 to n=2? the constant for Balmer's equation is 3.2881*10^15 s-1
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