Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
The molar mass of caffeine is 194.19 g. Is the molecular formula of caffeine C4H5N2O orC8H10N4O2?3.- HOw many grams of sulfur (S) are needed to react completely with 246 g of mercury (Hg) to form HgS?
What are the values of ΔG°and ΔS°at2000K? At what temperatre does the reaction become spontaneous?
Western Europe is culturally different from China. Discuss reasons for the differences in the population densities in these two regions keeping in mind economic, social, and culturalfactors. Western
Can population be adequately addressed by ever advancing science and technology or do the numbers eventually overwhelm the environment? If science and technology have limitless potential effec
The poor are often uneducated and uninformed about environmental issues. Does this mean that the poor would cause greater environmental degradation?
Determine the number of moles of HCl that canbe neutralized by an over the counter anatacid tablet that contains400mg Al(OH)2?
At a particular temperature, N2O5 decomposes according to afirst-order rate law with a half-life of 3.0 s. If the initial concentration of N2O5 is 1.0 x1016 molecules/mL, what will be the concentrat
What is the pH range of a buffered solution composed of equal molar concentrations of acetic acid and acetate? (Ka= 1.8x 10-5)
A 1.0L vessel was initially filled with pure NOBr(g) to apressure of 4.0atm. The final Partial pressure of NOBr was 2.5 atmafter the followign equilibrium was established: 2NOBr(g) <->2NO(g) +
A solution of 0.0205 M NaOH is used to neutralize 20.0 mLH2SO4. If 45.6 mL NaOH is required to reach the endpoint, what is the molarity of the H2SO4 solution?
Draw a balanced redox equation for theoxidation of CuI. Thanks in advance for your help!EDIT: Upon reading the instructions more carefully (actuallybackground information for which this is a follow-
Ideal gases A and B are kept in a 5.0 liter container at 20C. the pressure of teh gas mixture is 2.0 atm and it tis know that 0.10mole of gas A is present in the mixture.
How many molecules of ethane arecontained in 25.0 mL of butane? The density of butane is 0.6011g/mL and the molar mass is 58.12 g/mol.
How many grams of KClO3 will react with 67.8mL of 5.98M HClaccording to the reaction: KClO3 + 6HCl ----> 3 H2O + KCl+3Cl2?2 250 mL of a solution is made up from water and 2
Calculate the pH at the equivalence point in the titration of 50 mL of .10M methylamine with a 2.0M HCL solution.
A Rolaids tablet contains calcium carbonate to neutralize stomach acid. If 44.55 mL of 0.448 M hydrochloric acid is required to neutralize one tablet, how many milligrams of calcium carbonate are in
Kucharel is a polymer that is prepared by heating the dimethylester derived from cyclohexane-1, 4-dicarboxylic acid with ehyleneglycol. What is the repeating unit in Kucharel?
Calculate (a).the molar concentration of the ammonia solution and (b). convert to percent by mass concentration of ammonia (17.0 amu), given asolution density.
Experiments show that it takes 1656 kJ/mol to break all the boundsin methane ( CH4) and 4006 KJ/mol to break all the bonds in propane(C3H8) .Based on these data , calculate the average bound enthalp
Suppose a patient is given 155 mg of I-131, a beta emitter with a half life of 8.0 days. Assuming that none of the I-131 is eliminated from the person's body in the first 4.0 hours of treatment, wha
A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide. Use this data to calculate the mass percent composition of aluminum in aluminum oxide.
The rock in a particular iron ore deposit contains 83 %Fe2O3 by mass. How many kilograms of the rock must be processed to obtain 1300 kg of iron?
Fingernail-polish remover is primarily acetone(C3H6O). How many acetone molecules are in abottle of acetone with a volume of 405 mL? (density of acetone =0.788 g/cm3 ).
A 1.45 g sample of phosphorus burns in air and forms 2.57 g of a phosphorus oxide. Calculate the empirical formula of the oxide. Express your answer as a chemical formula.
A paper chromatograph is run for a solute that has a strong affinity for the solvent , and very little affinity for the paper. when properly developed, will the Rf for the solute benearly one , near