contestada

a mass of the crucible (g) 88.000g
b mass of the crucible and hydrate (g) 93.000g
c mass of the crucible and pure salt (g) 90.342g

2. Calculate the following:
Make sure to show work on (b), (d) and (e) to receive full credit.
a) mass of water in the hydrate sample (g)
b)number of moles of water in the sample
c) mass of pure salt in the sample (g)
d) number of moles of salt in the sample
e) molar ratio of water to salt in the sample

Respuesta :

a)5.000g
b)mole=mass/molarmass
             molar mass of H2O=18g
             mass of water=5g
b)mole of water=5.000/18.000=0.2778g
c)mass of salt=2.342g
d)mole of salt=mass/molar mass
                     pure salt is NaCl
                     molar mass of NaCl=58.50g
 d)mole of salt=2.342/58.5=0.040mol
e)mole ratio=0.27:0.04

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