Why are the internal structures of these limbs similar?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

What is the pressure of 0.500 moles of carbon dioxide gas in a 2.5 l tank and at a temperature of 301 k? (r=0.0821 l·atm/mol·k) 3.08 atm 1.2 atm 0.23 atm 4.01 atm 4.94 atm

Acompound is isolated from the rind of lemons that is found to be 88.14% carbon and 11.86% hydrogen by mass how many grams of c and h?