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

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

How many formula units in 2.63 mols of nacl?

Can anyone answer these questions? ? i need it before 1: 00pm today