How many moles of propane (C3H8) are in a 7.00 L tank at 20.0 c and 5.45 atm of pressure?

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Is this a single replacement reaction or there is no

What shape would a molecule with two bound groups and two lone pairs have?