Answer:
When the substance is cooled, its temperature will fall below 78 °C after 100% of the vapor has changed to liquid.
Explanation:
- Boiling point is the temperature at which a liquid changes state from liquid form to gaseous form without change in temperature. It may defined as the temperature at which the vapor pressure is equal to the pressure of the gas above the liquid.
- A liquid with a boiling point of 78°C, it means that, when the liquid is heated, its temperature will start rising above 78 °C after 100% of the liquid has changed to vapors. Additionally, when the liquid is cooled, its temperature will fall below 78 °C after 100% of the vapor has changed to liquid.
Answer:
The Answer is option D
Explanation:
The nucleus of a radioactive element is unstable. The nucleus will break down over time, reducing the amount of the element remaining.
Answer:
Filtration and evaporation
Explanation:
A mixture of sand, pink sugar and water can be separated by filtration and evaporation.
The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.
The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.
Answer:
They want to escape from the fury of a hurricane.
Explanation:
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(a) <u>7.32 moles of N₂</u>
(b) = 5.72 moles of NO
(c) 0.460 moles of O₂
Explanation:
We begin by balancing the chemical reaction involved;
N₂ + 0₂ → 2NO
The number in front of the elements or compounds indicate the mole ration involved in the reaction. One (1) mole of N2 and one (1) mole of O2 react to form two (2) moles of NO.
(a) Because the mole ratio between O₂ and N₂ is 1 : 1 then <u>7.32 moles of N₂</u> are needed to react with 7.32 mol of O₂
(b) Because the ration of N₂ and NO in the chemical equation is 1 : 2, then (2.86 * 2) moles of NO can be formed when 2.86 mol of N₂ reacts.
= 5.72 moles of NO
(c) (b) Because the ration of O₂ and NO in the chemical equation is 1 : 2, then (0.230 * 2) moles of O₂ must react to produce 0.230 mol of NO.
= 0.460 moles of O₂