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Magnesium combines with oxygen to form magnesium oxide. If 21.56 g of magnesium reacts completely with 5.41 g of oxygen, what is the percent by mass of oxygen in magnesium oxide?
Helium gas at constant pressure of 7.4 atm, expands in volume from 21.3 L to 79.2 L. The temperature is held at 278 K. Calculate the work done by the gas (in joules).
Hemoglobin has a positive charge of +5 and a radius of 3.55 nm in water. How far will the protein travel in one hour in an electrophoresis gel at 25C when a field of 1.0 V cm^-1 is applied if the viscosity of the gel is 0.891 cP (1cP = 0.01 g cm^-..
How many additional milliliters of titrant are needed to reach the first equivalence point of quinidine dihydrochloride. What is the pH at the first equivalent point
Determine the heat of combustion of ethyl alcohol (C_2 H_6 O). How much ethyl alcohol must be burned to generate enough heat to warm exactly one liter of water from 60 degrees faranheit to 180 degrees faranheit
how many of the following changes wouldalter the numerical value of the equilibrium constant kp for the reaction 2of2g
What would the molecular diagram look for oxygen bonding with bromine. Which are the bonding and which are the antibonding. When we did it this in class there were 8bonding and 5 anti. using a template.
Why is the density of an ethanol/water mixture dependant on temperature? and how would the density of the ethanol/water change IF the temperature was increased and decreased
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
A container is filled with 4.0 X 10^22 O2 molecules at 5 degrees C and 845 mmHg. What is the volume, in mL, of the container
A stream of humid air containing 1.00 mole % H2O(v) and the balance dry air is to be humidified to a water content of 10.0 mole % H2O. For this purpose
What weight of potassium formate should be added to make 900 mL of a pH 4.00 buffer solution
Calculate and plot the points where 0.00, 5.00, 10.00, 20.00, 25.00, 30.00, 35.00, 40.00, 45.00, and 50.00 mL of 0.075M KOH has been added
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