The addition of hydrochloric acid to a silver nitrate precipitates silver chlori

Question

The addition of hydrochloric acid to a silver nitrate precipitates silver chloride according to the reaction: AgNO_3 (aq) + HCI(aq) rightarrow AgCI(s) + HNO_3 (aq) When 50.0 mL of 0.100 M AgNO_3 is combined with 50.0 mL of 0.100 M HCI in a coffee-cup calorimeter, the temperature changes from 23.40 degree C to 24.21 degree C. Calculate Delta H_rxn for the reaction as written. Use 1.00 g/mL as the density of the solution and C = 4.18 j/8 degree C as the specific heat capacity. Methane, the main constituent of natural gas, burns in oxygen to yield carbon dioxide and water CH_4 (g) + 2 O_2 (g) rightarrow CO-2 (g) + 2H_2 O(l) Use the following information to calculate Delta H degree (in kilojoules) for the combustion of methane CH_4 (g) + O_2 (g) rightarrow CH_2 O (g) + H_2 O(g) Delta H degree = -284 kJ CH_2 O(g) + O_2 (g) rightarrow CO_2 (g) + H_2 O(g) Delta H degree = -518 kJ H_2 O (l) rightarrow H_2 O(g) Delta H degree = +44.0 kJ

Explanation / Answer

Q9.

V = 50 mL of M = 0.1 M AgNo3

V = 50 mL of M = 0.1 M HCl

Vtotal = 50+50 = 100 mL

mass = 100*1 = 100 g

dT = 24.21 - 23.40 = 0.81 °C

Qsolution = M*C*(dT)

Qsolution = (100 g )(4.18J/gC)(0.81C) =338.58 J

Note that

Qsolution = -Qreaction

Qreaction = -338.58

HRxn = Qreaction / moles reactant

mmol of reaction = 50*0.1 = 5 mmol = 5*10^-3 mol

HRxn = -338.58 / (5*10^-3) = -67716 J/mol = -67.716 kJ/mol

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