question archive A sample of iron was dissolved iin hydrochloric acid
A sample of iron was dissolved iin hydrochloric acid
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A sample of iron was dissolved iin hydrochloric acid. The liberated hydrogen was collected by displacement of water. The hydrogen occupied 262 mL at 26 c. The barometric pressure was 748 torr what mass of iron was disoleved? The vapor pressure of water is 25 torr at 26 c.
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Answer:
Pressure=0.98 atm
volume=0.262 l.
temperature=299 K
pressure due to water vapour=0.03 atm
so net pressure=1.01 atm
using PV=nRT,
0.262*1.01=n*(299/12)
or n=0.0106 moles
Fe+H2SO4--->FeSO4+H2
so moles of Fe=0.0106
so mass of iron=0.0106*56
=0.5936 grams
