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If sample of (NH4)2HPO4 is found to contain 2.85 · 10-3 g of P atoms how many (NH4)2HPO4 formula units are present? Write answer in scientific notation.
If sample of LiNO3 is found to contain 2.03 · 1018 N atoms how many moles of O atoms are present? Explain answer in scientific notation.
Write the essay which describes the energy changes which occur during chemical reaction. When is energy absorbed and when is it released?
Compute the final temperature when 11.3 gram sample of ice at 0oC is placed into the styrofoam cup containing 119 grams of water at 77.6 oC.
The 4.184 J/k g assumed in calculation for molar heat of neutralization of acid. How will this affect the final result for heat of neutralization?
What amount in grams of helium is in balloon? Remember n = moles 2. Can balloon ascend to 3000 meters without bursting?
Write brief essay explain the benefits of using fusion reactions for nuclear energy instead of fission. Also explain why we are not using fusion.
Describe results shown in table in terms of molecular structure of acetyl-CoA carboxylase and comment on their apparent physiological significance.
Write down the name of two categories of organic compounds (alkanes, aldehydes...) which have very strong characteristic odours.
CH4(g) + H2O(g)----> CO(g) + 3 H2(g) Hydrogen can be made by reacting natural gas (methane) with water, as give above. How much hydrogen can be formed from 695 g of methane and 1600 g of water?
Absorbance of the photon alters this E°' to -0.6V. Find the efficiency of energy capture in light reaction of P700 chlorophyll?
What volume of oxygen is needed to burn 22.4L of propane in combustion reaction, suppose that both gases are measured at temperature and pressure?
A student combusted 0.500g Al with oxygen according to reaction 4Al(s)+3O2(g)=2Al2O3(s), find the limiting reactant?
Write the balanced equation for equilibrium between MgO(s) and ions it produces in solution. Compute equilibrium constant for the reaction at 25 °C. Find the solubility of MgO in water?
What precipitate is produced when solutions of aluminum nitrate and calcium chromate are mixed? What mass of precipitate is produced when 358 mL of 1.58 M CuNO3 is mixed with 491 mL of 0.87 M Ba(OH)
Compute number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C. (Cp of H2O = 4.184 J/g °C). Specific heat of ethanol is 2.46 J/g oC.
A certain mass of water was heated with 41,840 Joules, increasing its temperature from 22.0 °C to 28.5 °C. Determine mass of water, in grams. (Cp of H2O = 4.184 J/g °C).
When 15.0 g of steam drops in temperature from 275.0 °C to 250.0 °C, how much heat energy is released? (Cp of H2O = 4.184 J/g °C).
Compute concentration of hydrochloric acid. Find the pH at equivalence point during acid-base titration of NaOH and HCl, having identical molarities?
Find the concentration of hydroxide ions in solution? Compute volume of Ba(OH)2 0.20 M essential to neutralize 300.0 mL of H3PO4 0.30 M.
Compute [H+] of the solution obtained by mixing 1 L of hydrochloric acid 1.0 M with 1 litre of sodium hydroxide 0.990 M.
What mass of NaOH(s) should be added to 300 mL of HCl 0.25 M to completely neutralize this acid?
After 50 mL of NaOH was added, no observable change had taken place. Find the procedural error in this experiment?
What problems and dangerous conditions can result from improper storage and use (i.e., mixing them together, etc.) of these chemicals?
Why do firefighters suggest the use of the deluging volume of water when extinguishing the oxidizer-supported fire?