Answer:
option D is the correct answer of this question.
Answer: formic acid (HCOOH) contains the greatest mass of oxygen
Explanation:Please see attachment for explanation
Answer:
a. -29.8 kJ/mol-rxn
Explanation:
For a chemical reaction system the forward and reverse rate are equal. The standard molar enthalpy formation of NH3 is -45.9 kJ/mol. For the enthalpy of NH3 (8) the molar enthalpy is -29.8kJ/mol. The molar mass of N2 = 28.02g/mol. Molar enthalpy of formation is standard amount of substance produced in the formation of a reaction. The molar enthalpy is the change in enthalpy due to reaction per mole.
I honestly dont know look at the guy above me answer
<span>I'm going to assume that the other reactant is sodium phosphate(you did not indicate this)
so i'm guessing that the reaction did this
CaCL2 + Na3(PO4) ------------> Ca3(PO4)2 + NaCl
(since this reaction was done in water(aqueous solutions involved) the NaCl would be in the solution and thus the filtrate of the product so it won't influence the mass of the calcium phosphate product)
so then you need to write the balanced equation for this reaction(lets assume you can do this)
3 CaCL2 + 2 Na3(PO4) ------------> Ca3(PO4)2 + 6 NaCl
so in theoretical analysis 3 moles of calcium chloride is involved in the production of 1 mole of calcium phosphate
in terms of molar mass equivalents 3 molesw of calcium chloride weigh = 3 x (40 + 71)g/mol = 333g
1 mole of calcium phosphate = 310 g
so if you only have 0.513 g of calcium chloride then this would calculate to get the mass of calcium phosphate
mass = [0.513 / 333] x 310 g = 0.477grams
your actual yield is what you massed when you performed the lab. hope that helped.
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