A student dissolves 5 g of table salt in 100 mL of water in a beaker. Compared to the total mass of the salt and water before mixing, which is true? A The total mass of the solution will increase by a small amount. B The total mass of the solution will increase by a large amount. C. The total mass of the solution will decrease by a small amount. D. The total mass of the solution will neither increase nor decrease.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

where's the diagram?

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

"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"