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Illusion [34]
3 years ago
5

O que é etnocentrismo​

Chemistry
1 answer:
Shtirlitz [24]3 years ago
4 0

Answer:

yes and bla bla

........

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A solution contains 72.0 g of HCI and 468 g of (C6H6). what is the mole fraction of benzene
erica [24]
<span>Molar mass (MM) of benzene C6H6
C = 6 * 12 = 72u
H = 6 * 1 = 6u
MM C6H6 = 72 + 6 = 78 g / mol
Benzene - Molar Mass = 78 g --------- 1 mol
Of A Mix has 468 g -------------- x

78x = 468
X = 468/78
X = 6 moles
 
Molar mass (MM) of Hydrochloric Acid HCl H = 1 * 1 = 1u
CI = 1 * 35 = 35u
MM HCl = 1 + 35 = 36 g / mol
 
Hydrochloric Acid - Molar Mass = 36 g ---------- 1 mol
Of A Mix has 72 g ------------ y

36y = 72
Y = 72/36
Y = 2 moles
 
Thus, a mixture has a total of 8 moles (6 mol + 2 mol).
Dividing One Mole Amount of Each Substance by the Number of Total Mole Amounts, Then we will obtain a Molar Fraction of Each:
Molar fraction make benzene = (6/8) simplify 2 = 3/4
Molar Fraction to make Hydrochloric Acid = (2/8) = simplify 2 = 1/4

Note:. The sum of the molar fractions of the always give goes 1, we have: 3/4 + 1/4 = 1
 

ANSWER: 
</span>\boxed{\frac{3}{4}}
4 0
3 years ago
Which of these salts has the highest pH? K^2SO^4 Cu^2SO^4 NH^4Cl NaCH^3COO
Wittaler [7]
The more acid the salt, the lower the pH. So we must find the salt that is most basic among the options. Our answer is NaCH_3COO, because it is formed by a weak acid (H_3COOH) with a strong base (NaOH).
7 0
3 years ago
Read 2 more answers
You have a 70% solution of dextrose. how many grams of dextrose are in 400 ml of this solution?
wlad13 [49]
The solution of dextrose has a w/v% of 70 %. this means the mass of dextrose is 70 % of the volume of the solution.
In 100 mL of the solution - mass of dextrose is 70 g
therefore in 400 mL of the solution - mass of dextrose is - 70 /100 x 400 = 280 g
mass of dextrose is 280 g 
4 0
3 years ago
Will upvote
nirvana33 [79]
The answer is cold air 
3 0
3 years ago
What kind of mistake has a scientist made if he accidentally spills a chemical that causes invalid conclusions? Is it a honest m
Alex Ar [27]
Honest mistake because he accidentally spilled it<span />
7 0
4 years ago
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