Answer:
E. temperature of the water
Explanation:
The independent variable is the variable that changes, and it's also the variable that the dependent variable's results depend on. So depending on the temperature of the water, results in the ice cubes height. So the independent variable is the temperature of the water.
Answer:
The necessary equations necessary are explained in each step in the solution.
Explanation:
For conversion of methanol gas at 65°C to -112°C
the equations would be as follows,
step 1 : gas at 65°C to liquid at 65°C
q = n(-37 kJ/mol)
step 2 : liquid at 65°C to liquid at -94°C
q = n(81.1 J/mol°C), where dT is negative
step 3 : liquid at -94°C to solid at -94°C
q = n(-3.18 kJ/mol)
step 4 : solid at -94°C to solid at -112°C
q = n(48.7 J/mol°C), where dT is negative
Answer:
0.74 moles of oxygen are required for combustion
Explanation:
Given data:
Number of moles of oxygen required = ?
Mass of Mg = 35.5 g
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 35.5 g/ 24 g/mol
Number of moles = 1.48 mol
Now we will compare the moles of Mg with oxygen.
Mg : O₂
2 : 1
1.48 : 1/2×1.48 = 0.74 mol
0.74 moles of oxygen are required for combustion.
None of above. only temperature stays constant.