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Chemistry Help: Hess's Law: I would appreciate an explanation and an answer.?

source : yahoo.com

Chemistry Help: Hess’s Law: I would appreciate an explanation and an answer.?

Using values from Appendix C, calculate the value of ΔH∘ for each of the following reactions.

1. CaO(s)+2HCl(g)→CaCl2(s)+H2O(g)

Values(DeltaHf) from Appendix:

CaO: -635.5, CaCl2:-795.8, H2O: -285.8, HCl:-92.3

Answer: four sig figs ΔH∘rxn

2. 4NH3(g)+O2(g)→2N2H4(g)+2H2O(l)

Values: same as above

NH3: -46.19, O2: 0, N2H4:95.4, H2O: -285.8

if u can, put this answer in 5 sig figs, and same units as previous one

I would really appreciate the help.

Rates of Chemical Reactions

Rates of Chemical Reactions – CaCO3(s) + 2HCl(aq) CaCl2(s) + H2O(l) + CO2(g). Each reaction started with 2 mol of HCl with excess calcium carbonate. As you can see from the graph, the rate of reaction tails off towards the end, as the HCl is being used up, i.e. its concentration is decreasing.CaCO3 + 2HCl —-> CO2 + H2O + CaCl2. The number of moles of HCl can be determined using the formula for Molarity. Is this reaction is a Redox or nonredox reaction? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g). Since the oxidation state of each element is the same on the right as it…Mass of CaCO3 (g) Mass of CaCl2 (g) For 100g of CaCO3 , 111g of CaCl_2$$ is formed. let for 2.5g of CaCO3 , x g of CaCl2 is formed. Thus, by cross multiplication

What mass of calcium carbonate can 2000. – Quora – CaO + 2H(+) + 2Cl(− )= Ca(2+) + 2Cl(−) + H2O CaO + 2H(+ )= Ca(2+) + H2O.Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a white coloured crystalline solid at room temperature, and it is highly soluble in water.#"CaO"_ ((s)) + color(red)(2)"HCl"_ ((aq)) -> "CaCl"_ (2(aq)) + "H"_ 2"O"_ ((l))#. You need #color(red)(2)# moles of hydrochloric acid for every mole of calcium oxide that takes part in the reaction. You an convert this mole ratio to a gram ratio by using the molar masses of the two compounds.

What mass of calcium carbonate can 2000. - Quora

CaCO3 + 2HCl CaCl2 + H2O + CO2 The mass of calcium chloride… – 8 – Colorless hydrogen gas (H2) and red-brown colored…So HCl is the LR and CaCO3 is in excess. mols CaCl2 = 0.18 x molar mass CaCl2 = ? How much of the CaCO3 is left unreacted? When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium…22. Calculate H rxnfor CaCO3(s)+ 2 HCl(g) CaCl2(s)+ H2O(l) + CO2(g)given the following: CaCO3(s) CaO(s) + CO.

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