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CHEM103 (DB425) Chemistry For Engineering
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For the reaction ZnO(s) + CO(g) ⇋ Zn(s) + CO2(g) Kc will be given by:
Ammonia gas can be prepared by the reaction of a basic oxide like calcium oxide with ammonium chloride, an acidic salt: CaO(s) + 2 NH4Cl(s) → 2NH3(g) + H2O(g) + CaCl2(s)
The theoretical yield for this reaction is 136 g. If 100 g of NH3 was produced, what is the percentage yield of NH3?
In the reaction of two hydrogen atoms to give a hydrogen molecule, H2:
2 H(g) → H2(g)
What is the sign of the enthalpy change (ΔH)? (positive or negative?)
What is the sign of the entropy change (ΔS)? (positive or negative?)
Silver phosphate is
If the following were formed from their elements which would produce the most heat per gram? (Heat of formation for NaOCl3 = -366 kJ/mol)
The valuable compound diborane, B2H6, can be made by the reaction: 2 NaBH4(s) + I2(s) → B2H6(g) + 2 NaI(s) + H2(g)
If 1.203 g of NaBH4 is reacted with excess iodine to form 0.295 g of B2H6, what is the percentage yield of B2H6?