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A compund with a formula mass of 42.08 amu is found to be 85.64% carbon and 14.36% hydrogen by mass. find its molecular formula. I did this problem and got c2h for the epirical formula then for the molecular formula i got c4h2 but im not sure thats right.
how many grams of dry nh4cl need to be added to 1.60 l of a 0.800 it m solution of ammonia nh3 to prepare a buffer
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 67.9kJ of heat. Before the reaction, the volume of the system was 8.80L . After the reaction, the volume of the system was 2.80L .Calculate the total internal energy change ..
Calculate the percent relative error for the three solutions if perfect technique is used. Report the two new molarities. (The error in a 10-mL transfer pipet is 0.02, and the error in the 200-mL volumetric flask is 0.1)
What compounds will be present after chemical reaction has occurred. Write out a balanced chemical reaction for this description, and name all compounds present.
Hydrochloric acid HCl are permitted to react at atmospheric pressure and the volume change is -71.1 liters then determine how much PV work is done?
consider the following reaction.ch3ohg cog 2 h2g h 90.7 kjcalculate e when 770.0 g of ch3ohg completely reacts at a
If pure PbI2 is allowed to dissolve in water and produces 5.0 x 10^-3 M I- what value of ksp can be derived
Calculate the moles and the mass of solute in 250.0 mL of 6.00 M NaOH.
A beaker with 165 mL of an acetic acid buffer with a pH of 5.000 is sitting on a bench. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.00 mL of a 0.390 M HCl solution to the beaker. How much will the pH c..
Does purified aspirin appear to be purer than crude aspirin? What is your evidence?
what is the actual amount of magnesium oxide produced when excess carbon dioxide reacts with 42.8grams of magnesium
Calculate the molar mass and the molecular formula of the solid. (Ki for diphenl is 8.00'C/m)
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