Answer:
A) 2.76 x 103 kJ
Explanation:
CH3OH (I)--------->CO (g) + 2H2 (g)
Number of moles contained in 87.1g of hydrogen gas= mass of hydrogen gas/ molar mass of hydrogen gas
Molar mass of hydrogen gas= 2gmol-1
Number of moles hydrogen gas = 87.1g/2gmol-1= 43.55 moles of hydrogen
1 mole of methanol yields 2 moles of hydrogen
x moles of methanol yields 43.55 moles of hydrogen
x= 43.55 moles of hydrogen × 1 mole of methanol/2 moles of hydrogen
x= 21.775 moles of methanol
Then;
If 1 mole of methanol absorbs 128KJ of energy
21.775 moles of methanol will absorb 21.775 × 128/1 = 2.7×10^3 KJ of heat
The concentration of solution : 0.2 M
<h3>
Further explanation
</h3>
Given
5.6 g Potassium hydroxide(KOH)
500 ml of solution = 0.5 L
Required
The concentration
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
MW KOH = 39+16+1=56 g/mol
mol solute(KOH) :
= mass : MW KOH
= 5.6 : 56 g/mol
= 0.1
Molarity :
= 0.1 : 0.5
= 0.2 M
Answer:
sodium + chlorine --> sodium chloride
Answer:
water because the other two were formed through a chemical process
