A gas at 10°C occupies a volume of 283 mL. If it is heated to 20°C, keeping the pressure constant, the new volume will be:
a 640 mL
b 293 mL
C 283 mL
d 566 mL

d

Explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.