practice questions

Hi there, im stuggling with some of these practice question in chemistry it would be great if you could explain how to work through them. I have answers for first two but not sure Al + H2o ——-> Al (OH)3 + H2.
Ag+ (aq) + e- = Ag (s)? the third I’m unsure of

Write the balanced equation for the reduction of silver ion in water to solid silver (hint: the silver ion has a charge of +1).

Write the balanced equation for the oxidation of aluminium from solid metal to an ion in water (hint: the aluminium ion has a charge of +3)

a solution of copper nitrate with a concentration of 0.100 moles per litre. What mass of copper nitrate should they weigh out to prepare one litre of this copper nitrate solution? Show all steps of your calculations and include the correct units where needed.

Thanks for your help!

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