Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams of 3.14 x 1023 molecules of formic acid.
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23.97 grams.

Explanation:

First we convert 3.14 x 10²³ molecules into moles, using Avogadro's number:

Then we convert 0.521 moles of HCOOH into grams, using the molar mass of formic acid:

The answer is 23.97 grams.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6