Calculate the molarity for each solution : a) 1.5 l of solution containing 2.5 mol of sugarb) 0.15 mol of h2so4 in 400 cm³ solutionc) 0.12 g of naoh in 325 ml of solution

a) c = n/V = 2.5 / 1.5 = 1.7 moles/dm3

b) c = n/V = 0.15 / 0.4 = 0.4 moles/dm3

c) n = m/M = 0.12 / 39.997 = 0.003 moles. c = n/V = 0.003 / 0.325 = 0.009 moles/dm3

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"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"