Answer:
True!
Explanation:
Soap molecules form something called micelle. If you look it up, these are usually formed if something has a hydrophobic tails (water hating) and hydrophilic heads (water loving).
So essentially when you try to get the grease off of your shirt or hand, the soap hydrophobic ends interact with grease and capture it and the water interacts with the hydrophilic heads to pull the micelle out releasing the grease.
17) 8.4 / 20 x 100
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
If 125 mL of a 3.5 M solution were evaporated, 0.438 moles of iron (II) nitrite would be recovered.
<h3>What is molarity?</h3>
Molarity is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of moles of solute per liter of solution.
We want to find the moles of iron (II) nitrite (solute) in 125 mL of a 3.5 M solution. We will use the definition of molarity.
M = n / V(L)
n = M × V(L) = 3.5 mol/L × 0.125 L = 0.438 mol
where,
- M is the molarity.
- n is the number of moles.
- V(L) is the volume of the solution in liters.
If 125 mL of a 3.5 M solution were evaporated, 0.438 moles of iron (II) nitrite would be recovered.
Learn more about molarity here: brainly.com/question/9118107
Answer:
Ethanol (boiling point 78°C) and methanol (boiling point 65°C) are two miscible liquids. There is only a small difference in their boiling points. These two liquids are separated from their mixture by fractional ths distillation.
When vapours of the mixture pass through the fractionating column, repeated liquefaction and vapourisation take place. Subsequently, the vapours of low boiling methanol enter the condenser from the fractionating column, condense to liquid and get collected in the round bottomed flask first. Similarly, ethanol with higher boiling point can be collected later in another round bottomed flask.
