When a pure solid Z sample it a covalent compound is heated continually for 11 minutes it will undergo disintegration leaving the bonds intact.
<h3>What is a covalent compound?</h3>
A covalent compound is a compound that is made up of molecules which share one or more pairs of valence electrons and are bonded together by a covalent bond.
One of the major factors that affect compounds with covalent bonds is temperature.
The increase in temperature during heating leads to the separation of the atoms from each other but leaving the bonds intact.
Learn more about covalent bonds here:
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Answer:
5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.
Explanation:

Moles of zinc nitrate = n
Volume of the solution = 135.0 mL = 0.1350 L
Molarity of the solution = 0.21 M


Mass of 0.02835 moles of zinc nitrate:
0.02835 mol × 189 g/mol = 5.358 g ≈ 5.36 g
5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.
The significant figure is only 1 which is just the number 5. The zeros don't count.