This is an application of Boyle's law:
P₁V₁ = P₂V₂. we don't have to convert volume and pressure to standard forms. we can even use the pressure with mmHg
1 atm = 760 mmHg
V₂ = P₁V₁ / P₂ = 745 x 500 / 760 = 490 ml
Note that here we assume constant temperature
4 total bonds if u have double,or triple then subtract from 4
Once you balance the enquation you "switch partners" of the element (negative charge to positive charge)
Answer: covalent bond
Explanation: Tetracarbon Hexahyride is built using covalent bonds
Hope this helps please mark brainlist it would be greatly appreiciated :)