The materials given are 7 envelopes, 16 stamps, 30 address labels, 20 rsvp cards, and 10 invitations, then the limiting reactant is 7 envelopes.
- Limiting reactant simply means the reactant that gets finished first when there is a chemical reaction and therefore brings a limit to the number of products that can be formed.
- It should be noted that when a limiting reactant occurs, it prevents other operations from continuing.
- Since the person has 7 envelopes, 16 stamps, 30 address labels, 20 rsvp cards, and 10 invitations, then the limiting reactant is 7 envelopes. In such a case, when the envelopes finish, then the mail can't be sent anymore.
In conclusion, the correct option is 7 envelopes.
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