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Zinc metal reacts with hydrochloric acid to produce hydrogen gas. How many liters of hydrogen can be produced at STP if 13.5g of zinc are reacted with excess HCl? Zn + 2 HCl --> H2 + ZnCl2
the freezing point of a CaCl2 solution is -25 degrees C. a) what is the molality(m) of the CaCl2 solution? b) what is the boiling point of the CaCl2 solution
question why does it take a temperature of almost 800 degrees c to melt nacl but stirring in water at room temperature
the catalyst reacts with the reactants. B. A catalyst initiates a chemical reaction. C. A catalyst lowers the activation energy of the reacting molecules
a 1.00l buffer solution is 0.250 m in hf and 0.250 m in naf. calculate ph of the solution after the addition of 100.0ml
Give an example of how innovative technology and products use thermochemistry. What are some ways the application of thermochemistry affects your life?
A student carried out a recrystallization and obtained a 105% yield of material with a broad melting point. The material was warmed gently resulting in a recalculated yield of 87% and a sharper melting point. Briefly explain these observations.
the molecules water and methane have similar masses but methane changes from a gas to a liquid at -161 degrees celsius.
calculate the velocity of an electron in the n1 state of h atom? show that the de broglie wavelenth of an electron
Explain what is the mass of the solid NH4Cl formed when 80.0 g of NH3 are mixed with an equal mass of HCl?
A 3.900 g sample of an unknown substance was dissolved in 20 ml of cyclohexane. The density of cyclohexane is .779 g/ml. The freezing point depression was 1.8 C compute molar mass.
potash is composed mainly of potassium carbonate. k2co3. if 1.000-g of potash reacts with sulfuric acid to produce 145
Question- What is the power output for a subject cycling at a cadence of 70 rpm and a resistance setting of 3 kp
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