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I am Lyosha [343]
3 years ago
11

Two compounds are tested for mass composition. Compound X contains 15.0 grams hydrogen and 120.0 grams oxygen. Compound Y contai

ns 2.0 grams of hydrogen and 32.0 grams of oxygen. Are compound X and compound Y the same compound?
Chemistry
1 answer:
4vir4ik [10]3 years ago
3 0
In order to determine if compounds X and Y are the same, the mole percentages of the elements present should be equal in both compounds.

For compound X

number of moles H = 15/ 1 =15 mol H
number of moles O = 120/ 16 = 7.5 mol O

total moles = 22.5 mol

mole percentages
% mole H = 67%
% mole O = 33%

For compound Y 

mole of H = 2 /1 = 2
mole of O = 32/16 = 2

total mole = 4 mole

mol %

% mol H = 50%
% mol O = 50%

there the two compounds are not the same.
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Answer:

Option D. AlCl₃, MgC₂

Explanation:

We need to dissociate all the salts, to determine the i. (Van't Hoff factor).

The salt who has the highest value, will be the better conductor of electricity

CsCl  → Cs⁺  +  Cl⁻   i = 2

CaCl → Ca²⁺ +  Cl⁻   i = 2

CaS → Ca²⁺ +  S⁻²    i = 2

Li₂S → 2Li⁺  +  S⁻²    i = 3

KBr →  K⁺  +  Br⁻       i = 2

AlCl₃ →  Al³⁺ + 3Cl⁻   i = 4

MgC₂  →  Mg²⁺  +  2C⁻   i = 3

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K₂S  →  2K⁺  + S⁻²   i = 3

The biggest i, is in pair D.

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3 years ago
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Rina8888 [55]

Answer:

D

Explanation:

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What is the fraction of the hydrogen atom's mass (11h) that is in the nucleus? the mass of proton is 1.007276 u, and the mass of
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Hello there!

To determine the fraction of the hydrogen atom's mass that is in the nucleus, we have to keep in mind that a Hydrogen atom has 1 proton and 1 electron. Protons are in the nucleus while electrons are in electron shells surrounding the nucleus. The mass of the nucleus will be equal to the mass of 1 proton and we can express the fraction as follows:

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<h3>Further explanation </h3>

Density is a quantity derived from the mass and volume

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The unit of density can be expressed in g/cm³ or kg/m³

Density formula:

\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}

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m = mass , g or kg

v = volume , cm³  or m³

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