15mL because if it started as 20 mL and went to 35mL when u put in pyrite, the pyrite takes up 15mL
        
             
        
        
        
We can use the ideal gas
equation which is expressed as PV = nRT. At a constant pressure and number of
moles of the gas the ratio T/V is equal to some constant. At another set of
condition of temperature, the constant is still the same. Calculations are as
follows:
T1 / V1 = T2 / V2
V2 = T2 x V1 / T1
V2 = 303.15  x 300 / 333.15
<span>V2 = 272.99 cm³</span>
 
        
             
        
        
        
Protein channels in the cell membrane
        
             
        
        
        
Answer: 
x=1.4*10^9 
or choice a
Hope this helps and please mark me brainliest! <3 >//<
 
        
                    
             
        
        
        
We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components.
Examples:
(a) Tea leaves are separated from tea.
(b) Pebbles are separated form rice and pulse.