First, you convert liters to moles. 
Usually you have to go to grams but this is STP.
Get moles directly by dividing the 4 by STP (22.4)

About 

 or 0.18 moles whichever your teacher prefers
 
        
        
        
Answer:
Clavulanic acid has two (2) chiral centers.
Explanation:
A chiral center is a center (usually carbon) with four different substituents.
The structure of clavulanic acid is shown in the attachment below.
Consider the labeled diagram in the attachment, 
Carbon A is not a chiral carbon because it has two hydrogen atoms attached to it
Carbon B  is not a chiral carbon because it has only three substituents
Carbon C  is a chiral carbon because it has four different substituents
Carbon D  is a chiral carbon because it has four different substituents
Carbon E  is not a chiral carbon because it has only three atoms directly attached to it 
Carbon F  is not a chiral carbon because it has only three atoms directly attached to it
Carbon G  is not a chiral carbon because it has two hydrogen atoms attached to it 
Carbon H  is not a chiral carbon because it has only three substituents
Then, only carbons C and D are chiral carbons.
Hence, clavulanic acid have two (2) chiral centers. 
 
        
             
        
        
        
No 
Water’s density is 1 g/cm3 and AL is 2700kg/m3
        
             
        
        
        
Answer:
partial pressure of gas D Pd = 15.5 kPa
Explanation:
As per the Dalton's law of partial pressure, in a mixture, pressure exerted by each gas when summed gives the total partial pressure exerted by mixture.
P(Total) = P1+P2+P3.....
Given P(Total) = 35.7 kPa
Partial pressure of gas A Pa = 7.8 kPa
Partial pressure of gas B Pb = 3.7 kPa
Partial pressure of gas C Pc =  8.7 kPa
There, Partial pressure of gas D Pd = P(Total) -(Pa+Pb+Pc)
 Pd = 35.7-(7.8+3.7+8.7) = 35.7-20.2 kPa = 15.5 kPa
Therefore, partial pressure of gas D Pd = 15.5 kPa
 
        
             
        
        
        
The answer 
<span>the molar ratio for the following equation 
____C3H8 + ____O2 Imported Asset ____CO2 + ____ H2O
</span>after it has been properly balanced:
__1_C3H8 + ____5O2 Imported Asset ____3CO2 + ____ 4H2O
proof:
number of C =3  (C3H8;   3CO2)
number of H =8 (C3H8 ; 4H2O)
number of O = 10(5x2) or (2x3+4)  (5O2;4H2O)
the answer is 
<span>Reactants: C3H8 = 1, O2 = 8; Products: CO2 = 3 and H2O = 4</span>