2) 11.2
All you have to do is multiply 44 by 22.4 L, which equals 985.6
Then you divide 985.6 by 88 to get your answer of 11.2 L 
        
             
        
        
        
<span>Metalloids have the properties of metals and nonmetals.</span>
        
             
        
        
        
<u>We are given:</u>
Mass of ice = 21 grams
The ice is already at 0°c, the temperature at which it melts to form water
Molar heat of fusion of Ice = 6.02 kJ/mol
<u>Finding the energy required:</u>
<u>Number of moles of Ice: </u>
Molar mass of water = 18 g/mol
Number of moles = given mass/ molar mass
Number of moles = 21 / 18 = 7/6 moles
<u>Energy required to melt the given amount of ice:</u>
Energy = number of moles * molar heat of fusion
Energy = (7/6) * (6.02)
Energy = 7.02 kJ OR 7020 joules
 
        
             
        
        
        
  The initial  mass  of sodium hydroxide  is  3.3 g (answer C)
  <u><em>calculation</em></u>
 Step 1 : find the  moles of iron (ii) hydroxide (  Fe(OH)₂
 moles =  mass÷  molar mass
 from periodic table the  molar mass of Fe(OH)₂  = 56 + [16 +1]2  = 90 g/mol
moles  is therefore = 3.70 g÷ 90 g/mol = 0.041 moles
Step 2:  use the mole ratio to  calculate the moles of  sodium hydroxide (NaOH)
    from given equation  NaOH : Fe(OH)₂    is 2 :1 
therefore the moles of NaOH = 0.041 x 2 = 0.082 moles
Step 3: find  mass of NaOH
mass = moles x molar mass
from the periodic table the  molar mass of NaOH = 23 +16 +1  = 40 g/mol
mass  = 0.082  moles x 40 g/mol = 3.3 g ( answer C)