Answer:
The ice will not melt
Explanation:
Given:
Mass of chunk = 0.25 g
moles of sodium = mass / molar mass = 0.25 / 23 = 0.010 g
ΔH = -368 KJ
Hence, 2 moles of Na produced 368 KJ
So 1 mole will produce 368 / 2 KJ and 0.01 mole will produce
= (368 / 2) * 0.01 = 2.0056 KJ
Also, moles of ice = mass / molar mass of water = 50 / 18 = 2.8 g
Energy required to melt the ice = enthalpy of fusion of ice * number of moles of ice
= 6.01 * 2.8 = 16.722 KJ
But we have 2.0056 KJ, so the ice will not melt.
Answer:
Pressure will increase by the direct ratio of the volume change. Therefore, since volume changes from 145 to 80, pressure will go up by the ratio change 145÷80 times the original pressure 125 kPa. Sure, you can use the more complicated gas law equation PV = nRT but we are only varying volume so the question boils down to the change in one simple variable.
Putting them together we have: 145÷80 x 125 = 226.5625 or just 226 kPa since the accuracy of the figures and the equation are not great.
Explanation:
Sulfuric Acid (H2SO4) is a strong mineral acid that has is colorless when pure. This chemical is used as a chemical intermediate to manufacture other chemicals and cleaning metal surfaces. The formula for sulfuric acid is H2SO4. The molar mass of sulfuric acid is 98.07848 g mol.
A negative ΔH and ΔS suggests that the reaction is exothermic and the leads to a decrease in the entropy of the system. In this case, the spontaneity of the reaction depends on the temperature and reaction is spontaneous at low temperature and non-spontaneous at a high temperature.