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Instructions: Calculate the mass percent composition of a compound. Show all of your work.
1. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2O.
2. Calculate the mass of manganese (Mn) in potassium permanganate (KMnO4).
Instructions: Calculate the empirical or molecular formula for compounds. Show all of your work.
3. A 2.87 g sample of carbon reacts with hydrogen to form 3.41 g of car fuel. What is the empirical formula of the car fuel?
4. Glucose is a carbohydrate that contains carbon, hydrogen, and oxygen. The empirical formula of glucose is CH2O and its molar mass is 180.12 g/mol. Find the molecular formula of glucose.
a volume 505 mL of air on a cold winter day at -15 degrees celcius is breathed into the lungs, where body temperature is 37 degrees celcius
Determine Ecell (in V) for a cell composed of a In electrode in a solution of In3+ coupled to a standard hydrogen electrode (SHE) under standard conditions.
Problem- (a) Compute the radius r of an impurity atom that will just fit into an FCC octahedral site in terms of the atomic radius R of the host atom (without introducing lattice strains.
The melting point of water is 0.000C at 1 atmosphere. If 11.64 grams of chromium(II) acetate, (170.1 g/mol), are dissolved in 287.2 grams of water .what is the molarity?
If a 220 piece of gold (density =19.32 ) is hammered into a sheet measuring 2.41.0 , what is the average thickness of the sheet in meters?
A closed end manometer was constructed from a u-shaped glass tube which was 80.0 centimeters high. It was loaded with mercury so that the closed side was filled all the way to the top (80.0 cm above the neck)
When 2.56g of a compound containing only carbon, hydrogen, and oxygen is burned completely, 3.84g of CO2 and 1.05g of h20 are produced. What is the empirical formula of the compound
A 275.0 mL sample of O2 is collected over water at 60.0 degrees Celsius. The total pressure is 755 torr. What is the volume of the O2 at STP? (The vapor pressure of water at 60 degrees Celsius is 149 torr)
Question- Determine the wavelength of the line in hydrogen atoms spectrum corresponding to the n1= 3 to the n2= 4 transition
Exactly 37.2mL of hydrogen is collected over water at 29C and 745.0 torr. The vapor of water at 29C is 30.0 torr. Explain what is the volume of dry hydrogen collected at S.T.P
78.6 g of H2SO4 is present initially. How many grams of NaOH are needed to neutralize H2SO4?
Iron has a density of 7.9 g/ cm3. What is the mass of a cube of iron with the length of one side equal to 55.0 mm.
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