Lithium reacts with water: 2 Li + 2 H₂O → 2 LiOH + H₂…
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Lithium reacts with water: . What mass of hydrogen is made by of lithium? (, .)
Need a reminder? The key ideaShow
Group 1 metals are soft, have one outer electron and react with water to give hydrogen and an alkali; reactivity rises down the group. Group 2 metals are harder and less reactive. Halogens, group 17, get darker and less reactive down the group, and a more reactive halogen displaces a less reactive one. Noble gases have full shells.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Moles of lithium. .
Step 2. Moles of hydrogen. .
Step 3. Mass. .
Answer: of hydrogen.
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