Answer:
algun moderador puede acabar a este otro este me borró respuesta que no debió borrar
 
        
             
        
        
        
Answer: Mass of gas is 0.001 pounds.
Explanation:
Density is defined as the mass contained per unit volume.
 
Given : Mass of gas = ? 
Density of gas =  
Volume of gas = 389 ml = 0.389 L     (1L=1000ml)
Putting in the values we get:
 
 
   
 (1g =0.002 lb)
       (1g =0.002 lb)
Thus the mass of gas is 0.001 pounds.
 
        
             
        
        
        
Mass =?
moles of N2 = 4.25 x 103 mol
molar mass of N2 = (14)x2 = 28
        
             
        
        
        
Answer:
Ok; just use PV=nRT solve for n.
Explanation:
 
        
             
        
        
        
Answer:  There are 6.9 mol of  are required to react completely with 2.30 mol of S.
 are required to react completely with 2.30 mol of S.
Explanation:
The given reaction equation is as follows.

Here, 1 mole of S is reaction with 3 moles of  which means 1 mole of S requires 3 moles of
 which means 1 mole of S requires 3 moles of  .
.
Therefore, moles of  required to react completely with 2.30 moles S are calculated as follows.
 required to react completely with 2.30 moles S are calculated as follows.

Thus, we can conclude that there are 6.9 mol of  are required to react completely with 2.30 mol of S.
 are required to react completely with 2.30 mol of S.