1. A 6.98 g copper ball reacts with HNO3. How many moles of No, gas could we produce? Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O
Plan:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

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the answer to this question is 3.