Show work 5.0 g of the mixture of SiO2, NaCl, and NH4Cl was heated to remove NH4Cl. If 1.52 g NH4Cl was sublimed away, and 2.0 g of SiO2 was left in the container. Calculate the percent of NaCl in the mixture.
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- __C₅H₁₂ + __O₂ --> __H₂O + __CO₂ To balance the attached reaction, what coefficient needs to be put in front of the H₂O?The same student wanted to determine the heat of dissolution for potassium chlorate (KClO3, MW: 122.55 g/mol) in water. He measured 10 grams of KClO3 and dissolved it in a calorimeter containing 250 g of water. The temperature drop was 3.5 K. a.) What is qH2O? b.) What is qrxn c.) What is ΔHrxn? d.) Is the reaction endothermic or exothermic?The standard heat of formation of lead II nitrate corresponds to the reaction ... a) Pb(OH)2 (s) + 2 HNO3(aq) = Pb(NO3)2 (aq) + 2H2O(l)b) Pb(s) + N2(g) + 3 O2(g) = Pb(NO3)2 (s)c) Pb 2+ (aq) + 2 NO3 1-(aq) = Pb(NO3)2 (aq)d) Pb 2+ (aq) + 2 NO3 1-(aq) = Pb(NO3)2 (s)e) Pb(g) + N2(g) + 3O2(g) = Pb(NO3)2 (g)
- Calculate the molar mass for Mg3(PO4)2, Ca(OH)2, and P2Cl5 (Show work)Using the equation 2Mn(OH)2(s)+O2(aq)->2MnO(OH)2(s), Determine the number of moles of MnO(OH)2 Formed for every one mole of O2 consumed. Show work.What is ∆H for the reaction PbO(s) + C(s) → Pb(s) + CO(g) if 5.95 kJ must be supplied to convert 13.43 g lead(II) oxide to lead?
- A student measured qrxn for the reaction of 0.492 g of a metal, X(s)(molar mass = 81.72), with HCl(aq) to be -874 J. Assuming this metal reacts in the same manner as magnesium, what is the ΔH°f (in kJ/mol) for this metal's cation in solution, i.e., X2+(aq)? Report your answer to the correct number of significant figures and only include the numerical answerShow all calculations and steps: 9. Determine the amount (in moles) of 53.45 g of lithium carbonate. Show all work.The Ecell of a reaction was found to be +0.78 V. What is the ∆G° of the reaction? ne=1 mol
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