Answer
The mass of hydrogen given off during the reaction is 0.2 g.
Work Step by Step
1- Step one: Apply the law of conservation of mass for this chemical reaction:
m (of iron wire) + m (of diluted hydrochloric acid) = m (of hydrogen gas) + m (of content left in beaker)
2- Step two: Replace the mass of iron wire, mass diluted hydrochloric acid and mass of content left in beaker:
5.6 g + 15.0 g = m (of hydrogen gas) + 20.4 g
3- Step three: find the mass of carbon dioxide
20.6 g = m (of hydrogen gas) + 20.4 g
20.6 g – 20.4 g = m (of hydrogen gas)
m (of hydrogen gas) = 0.2 g
