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In a certain experiement, 4.6 g Al is reacted with excess oxygen and 6.8 g of product is obtained according to this reaction: 4 Al = 3 O2 --> 2 Al2O3 What is the theoretical yield for this reacti
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons and nonbonding electrons. Show the formal charges of all atoms in the correct stru
How much heat is needed to melt 1050g of the unknown at 510k. the melting point of the solis unknown is 670k and the boilding point is 800k.
How many grams of Cu metal (63.55 g/mol) will be plated out of a Cu(NO3)2 solution by passing a current of 3.00 amperes for 11 minutes?
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. Briefly explain how the difference simply may be sampling error.
A 4.10 g nugget of pure gold absorbed 278 J of heat. What was the final temperature of the gold if the initial temperature was 25.0°C? The specific heat of gold is 0.129 J/(g·°C).
A perfect percent yield would be 100%. For each reaction, comment on your degree of accuracy and suggest possible sources of measurement error. How could these errors be reduced in the future?
A sample of nitrogen gas in a 4.7-L container at a temperature of 28°C exerts a pressure of 3.6 atm. Calculate the number of moles of gas in the sample.
when 50. grams of ethane gas is burned completely in oxygen. Carbon dioxide and water vapor are produce. How many mole of water vapor are produced?
Draw the molecular orbital diagram for O2. Assuming that the 2p molecular orbital is from the 2pz atomic orbitals and that the two 2p orbitals are from the 2px and 2py atomic orbitals.
Based on molecular structure, arrange the following sets of oxyacids in order of increasing acid strength.HClO3 ,HIO3 ,HBrO3. Explain.
What is the freezing point of a solution made by dissolving 352 g of ethylene glycol (C2H6O2) in 648 g of water? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/
a sample of hydrogen effuses through a porous container about 9.00 times faster than an unknown gas. estimate the molar mass of the unknown gas.
What is the total number of moles of aluminum oxide that can be formed when 54 grains of aluminum reacts completely with oxygen?
What is mass of O2 released? (0.2004g) How many moles of O2 were released? (.0063g) How many moles of KClO3 required by the moles of O2 released? (2 moles)
Cheap ethanol, C2H5OH, manufactured from crude oil, can be used in fake wine instead of of ethanol derived from fermentation of grapes. this fake wine.
What is the pH of a buffer prepared by adding 180 mL of 0.100 M NaOH to 200 mL of 0.100 M acetic acid? (Ka for CH3COOH = 1.8 x 10-5)
In a reaction 8200 g of sodium reacts with 74.00 g of ferric oxide to form sodium oxide and iron metal. Calculate the mass of sodium iron produced.
An “A” group metal (M) reacts with chlorine and oxygen to form ionic compounds with the formulas MCl4 and MO2. Propose a possible identity for the metal M. Explain your reasoning.
A 250.0 mL sample of chlorine gas is collected when the barometric pressure is 798 mmHg. What is the volume of the sample after the barometric pressure dropped to 745 mmHg?
If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant-volume container.
A gas sample was collected over water at 25.3oC. The total pressure is determined to be 0.97 atm. What is the partial pressure of the gas that was collected?
How much aspirin can be made from 100.0 g of salicylic acid and 100 g of acetic anhydride? If 122 g of aspirin were obtained by the reaction, what is the percent yield?
For IF5 draw an appropriate Lewis structure. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
50.0 mL of 2.00 M H2SO4 react with 75.0 mL of 2.00M NaOH. Identify the limiting and excess reactants. How many grams of Na2SO4 will be formed.