Answer:
The molar mass of sodium oxide (Na20) is 61.98 grams.
We will use boiling point formula:
ΔT = i Kb m
when ΔT is the temperature change from the pure solvent's boiling point to the boiling point of the solution = 77.85 °C - 76.5 °C = 1.35
and Kb is the boiling point constant =5.03
and m = molality
i = vant's Hoff factor
so by substitution, we can get the molality:
1.35 = 1 * 5.03 * m
∴ m = 0.27
when molality = moles / mass Kg
0.27 = moles / 0.015Kg
∴ moles = 0.00405 moles
∴ The molar mass = mass / moles
= 2 g / 0.00405 moles
= 493.8 g /mol
<span>Lighting a sparkler is considered a spontaneous reaction even though it doesn't start spontaneouslybecause it can occur by itself, or without the influence of any external forces once it is given the necessary energy needed for it to begin the reaction.
The lighting of a sparkler is a common example of a spontaneous reaction which is often given in Science textbooks and exams around the world.</span>
Answer:
True
Explanation:
True.
Recycling of metal means that there is a reduction in the cost of fuel, since much lesser metal ore would have to be mined and eventually transported. Recycling of metal also means saving of energy since we won't be mining ores from the beginning all over again, as compared. There is lesser number of quarries needed as well.