Answer:
Both oil and gasoline molecules are nonpolar, while water is polar. Nonpolar solvents have a tendency to dissolve other nonpolar molecules.
Explanation:
Molecules may be categorized as "polar" or "nonpolar" according to <em>difference in the atom's electronegativity.</em>
<u>Water is polar</u> because it consists of two types of atoms that<em> do not cancel out each other.</em> It is made of two atoms of Hydrogen and only one atom of Oxygen. This makes the Oxygen<u> partially negative</u> and the Hydrogen <u>partially positive.</u> This allows them to readily bond with other polar molecules like sugar. However, it cannot mix freely with oil and gasoline because<em> both of these are nonpolar. </em>Nonpolar molecules do not have much difference when it comes to their atoms' electronegativity. <em>Therefore, they have the tendency to dissolve molecules which are nonpolar as well. </em>This explains why oil molecules can mix freely with gasoline.
Hey there: !
density = 19.32 g/cm³
mass = 54.82 g
Volume = ?
therefore:
D = m / V
19.32 = 54.82 / V
V = 54.82 / 19.32
V = 2.837 cm³
Answer:
1. 0.22 mol/dm³
2. 0.23 mol/dm³
Explanation:
Molarity: This can be defined as the concentration of a substance in mol per dm³
1.
M = n/v ...................... Equation 1
M = molarity of methanol, n = number of mole of methanol, v = volume of the solvent/water/solution.
<em>n = g/m.m</em>
<em>Where g = mass of methanol, m.m = molar mass of methanol.</em>
<em>g = 6.4 g, m.m = 32 g /mole.</em>
<em>n = 6.4/32 = 0.2 mole</em>
<em>and ,</em>
<em>v = m/d </em>
<em>Where m = mass of water, d = density of water</em>
<em>m = mass of 50 moles of water = 18×50 = 900 g.</em>
d = 1000 g/dm³.
v = 900/1000 = 0.9 dm³
Substituting the value of v and n into equation 1
M = 0.2/0.9
M = 0.22 mol/dm³
2.
M = n/v
v = volume of the solution
v = (mass of methanol + mass of water in the solution)/density of the solution
v = [(900+6.4)/1000]/1.03
v = 0.9064/1.03
v = 0.88 dm³
n = 0.2 mole
Therefore,
M = 0.2/0.88
M = 0.23 mol/dm³
Answer : The mass of benzyl salicylate needed to manufacture 350 tubes of sunscreen are, 1.55 kg
Explanation :
As we are given that a sunscreen preparation contains 2.60 % by mass benzyl salicylate. That means, 2.60 grams of benzyl salicylate present in 100 g of solution.
First we have to convert the given mass from oz into kg.
Conversion used:
1 kg = 35.274 oz
or,
So,
Now we have to determine the mass of benzyl salicylate.
As, 100 g of solution contains mass of benzyl salicylate = 2.60 g
So, 0.1701 kg of solution contains mass of benzyl salicylate =
Now we have to determine the mass of benzyl salicylate are needed to manufacture 350 tubes of sunscreen.
Mass of benzyl salicylate in 350 tubes of sunscreen = 0.00442 kg × 350
Mass of benzyl salicylate in 350 tubes of sunscreen = 1.55 kg
Thus, the mass of benzyl salicylate needed to manufacture 350 tubes of sunscreen are, 1.55 kg