Answer:
The correct answer is - false.
Explanation:
At the energy-generating station, when the coal is burned, the chemical energy store in the coal converted into thermal energy and light or luminous energy.
The thermic energy generated used to heat and boil the water or liquid to generate the gas and generate the kinetic energy to move the fan that is desgined to generate the electrical energy.
Thus, the statment is false statement as it does not convert into sound energy.
Answer:
73 g Mg(OH)₂
Explanation:
To find the mass of magnesium hydroxide, you need to (1) convert formula units to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass). Remember to arrange the conversions/ratios in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 2 significant figures because the given value (7.5 x 10²³) has 2 sig figs.
Avogadro's number:
6.02 x 10²³ formula units = 1 mole
Molar Mass (Mg(OH)₂):
58.32 g/mol
7.5 x 10²³ units Mg(OH)₂ 1 mole 58.32 g
----------------------------------- x ---------------------------- x -------------------- =
6.02 x 10²³ units 1 mole
= 73 g Mg(OH)₂
Answer:
Gases we Breathe Out
It is the same air that we inhale. ... The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide.
density= mass/volume
we need the volume of the metal to find the density, in which case the answer would be 64.2/volume=density
