Answer:
Option D, 116 g of NaNO3
Explanation:
An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.
At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer
<h3><u>Answer;</u></h3>
D) Li + N2
<h3><u>Explanation;</u></h3>
- A decomposition reaction is a type of chemical reaction in which one reactant yields two or more products.
- <em><u>Lithium nitride undergoes thermal decomposition to produce Lithium and nitrogen gas. This reaction takes place at a temperature of 300° to 500°C in a vacuum.</u></em>
- The equation for the reaction is;
2Li3N(s) → 6Li(s) + N2(g)
Answer:
(F) (O) (N) (C) (B) (Na)
Explanation:
Fluorine has the highest electronegativity,while Oxygen comes 2nd. Then Nitrogen 3rd, Carbon 4th then Boron 5th while Sodium has the lowest electronegativity.
One calorie is equal to approximately 4.2 joules.
Percent by mass of platinum in white gold = 100% - 45% = 55%
We let x be the mass of the white which is 45% gold and 55% platinum.
Mass of gold in white gold = m x 0.45
where m is the total mass.
From the given above, we formulate the equation that would allow us to determine the mass of white gold.
154 = x (0.45)
x = 342.22 g
Then, we determine the amount of platinum.
mass of platinum = (342.22 g)(0.55)
mass of platinum = 188.22 grams
Thus, 188.22 grams of platinum is needed.