Asample of ammonia gas, nh3, has a volume of 285.0 ml at a pressure of 98.50 kpa. what will the volume of the ammonia be at a pressure of 94.20 kpa? assume that all other properties of the gas remain constant.

We know that an ideal gas keeps the relation between pressure, volume and temperature constant.
    P * V / T = constant
   Then if we have the gas in two diferente state:
   P1*V1/T1 = P2*V2/T2
    Temperature remain constant so then:
   P1*V1 = P2*V2
  98.5*285 = 94.2*V2
  V2 = 98.5*285/94.2 = 298 ml
   So the volume of the ammonia will be 298 ml

Using Avogadro's law 

where: P1V1/n1T1 = P2V2/n2T2 

The problem states it implicitly but n and T are constant 

P1V1 = P2V2 

V2 = P1V1/P2 

P1 = 98.50 kPa 
V1 = 285.0 mL 
P2 = 94.20 kPa 

V2 = (98.50 x 285)/94.20 
V2 = 298.00 mL 

The volume increases to 298 mL.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .