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A .5647 sample of a compound known to contain merely carbon, hydrogen and oxygen was found in oxygen to yield .8635 g of CO2 and .1767 g of H20. Explain what is the empirical formula of the compound?
A) CHOB) C2H2OC) C3H3O2D) C6H3O2E) C3H6O2
A 50.0 mL sample of 0.155 M HNO2(aq) is titrated with 0.100 M NaOH(aq). What is the pH of a solution after the addition of 25.0 mL of NaOH. (Ka of HNO2 = 4.5 ´ 10-4)
is an electron ever even momentarily found between the first and second energy levels? explain based on the wave
A solution is prepared by mixing 50.0 mL of 0.50 M Cu(NO3)2 with 50.0 mL of 0.50 M Co(NO3)2. Sodium hydroxide is added to the mixture. Which precipitates first?
The saturation value of DO is 8.5 mg/L. The deoxygenation coefficient (kd) is 0.61/d, and the reaeration coefficient (kr) is 0.76/d. Assume complete and instantaneous mixing of the sewage and river. What is the minimum DO downstream
Compare HASAW Act with Occupational health and safety regulations of Sultanate of Oman. and give an outline of what would be needed to set up a suitable safety management system to control the hazards in a chemical process industry
Calculate the final temperature of the solution, assuming the delta H reaction for HCl + NaOH = -56.2 kJ/mole and that the solution's specific heat is the same as water: 4.184 J/g Celsius.
write a chemical equation for the formation of Na and N2 from sodium azide
Still on Le Chatelier's principle, Ketones are known to be less reactive in aldol condensations.
It is quickly degraded in the atmosphere though reaction with OH• and O3 to form non volatile species which then form particles. These latter ones are responsible for the haze.
A flask containig helium gas is connected to an open ended mercury manometer. the open end Is exposed to the atmosphere, where the prevailing peessure is 752 torr. the mercury level in the open arm is 26mm above thAt in the arm connected to the fl..
Write balanced ionic equation, net ionic equation, oxidation half reaction and reduction half reaction when liquid sodium chloride is electrolyzed.
the gas sample weighs 2.62grams then computes the molecular weight and determines the identity of the gas.
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