OK, so to answer this question, you will simply use the molality equation which is as follows:
<span>M1V1 = M2V2 
In the givens you have:
M1 = 2M
V1 is the unknown
M2 = 0.4M
V2 = 100 ml
</span>plug in the givens in the above equation:
<span>2 x V1 = 0.4 x 100 
</span>therefore:
V1 = 20 ml
Based on this: you should take 20 ml of the 2 M solution and make volume exactly 100 ml in a volumetric flask by diluting in water.
        
             
        
        
        
Answer:
Given, 0.29 g of hydrocarbon produces 448ml of CO2 at STP. then, C2H5 is the emperical formula of hydrocarbon . n = 2 , hence, molecular formula will be C4H10
 
        
             
        
        
        
Explanation:
Organic compounds are defined as the compounds which contain carbon as their main element. For example,  is an organic compound.
 is an organic compound.
Generally, organic compounds are non-polar in nature and due to the presence of covalent bonding organic compounds have low melting point.
As compound A melts at  and is soluble  in water. This means it is an ionic compound as it has high melting point and it is also polar in nature.
 and is soluble  in water. This means it is an ionic compound as it has high melting point and it is also polar in nature.
Whereas compound B melts at  and is insoluble  in water. This means that this compound has covalent bonding and it is also non-polar in nature
. Hence, it is more likely to be organic in nature.
 and is insoluble  in water. This means that this compound has covalent bonding and it is also non-polar in nature
. Hence, it is more likely to be organic in nature.
Thus, we can conclude that compound B is more likely to be an organic
compound.
 
        
             
        
        
        
Explanation:
The given data is as follows.
         Concentration of solution = 0.5 M
         Volume of solution = 1 L
Molar mass of Glycylglycine = 132.119 g/mol
As molarity is the number of moles present in liter of solvent.
Mathematically,      Molarity = 
Hence, calculate the number of moles as follows.
             No. of moles = Molarity × Volume
                                   = 
                                   = 0.5 mol
Therefore, mass of glycylglycine = mol × molar mass
                                                       = 
                                                       = 66.06 g
Thus, we can conclude that 66.06 g glycylglycine is required.