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Two elements X (atomic mass = 75) and Y (atomic mass = 16) combine to give a compound having 75.8% of X. The formula of the compound is:

  • a)
    X2Y3

  • b)
    X2Y

  • c)
    X2Y2

  • d)
    XY

Correct answer is option 'A'. Can you explain this answer?
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Solution

Given: Atomic mass of X = 75
Atomic mass of Y = 16
Percentage of X in the compound = 75.8%

Let us assume that the compound has a total mass of 100 g. Then,
Mass of X in the compound = 75.8 g
Mass of Y in the compound = (100 - 75.8) g = 24.2 g

Now, we need to find the simplest ratio of X and Y in the compound to determine the formula.

Dividing the mass of X and Y by their respective atomic masses, we get:
Number of moles of X = 75.8/75 = 1.01
Number of moles of Y = 24.2/16 = 1.51

Dividing both by the smaller value, we get:
Number of moles of X = 1.01/1.01 = 1
Number of moles of Y = 1.51/1.01 = 1.5

The simplest ratio of X and Y in the compound is 1:1.5 or 2:3.

Therefore, the formula of the compound is X2Y3. Hence, option (a) is the correct answer.

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Solution

Given:
Atomic mass of X = 75
Atomic mass of Y = 16
Percentage of X in the compound = 75.8%

Let us assume that the compound has a total mass of 100 g. Then,

Mass of X in the compound = 75.8 g

Mass of Y in the compound = (100 - 75.8) g = 24.2 g

Now, we need to find the simplest ratio of X and Y in the compound to determine the formula.

Dividing the mass of X and Y by their respective atomic masses, we get:

Number of moles of X = 75.8/75 = 1.01
Number of moles of Y = 24.2/16 = 1.51

Dividing both by the smaller value, we get:
Number of moles of X = 1.01/1.01 = 1
Number of moles of Y = 1.51/1.01 = 1.5

The simplest ratio of X and Y in the compound is 1:1.5 or 2:3.

Therefore, the formula of the compound is X2Y3. Hence, option (a) is the correct answer.
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Community Answer
Two elements X (atomic mass = 75) and Y (atomic mass = 16) combine to ...
Its answer is option (a)
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Two elements X (atomic mass = 75) and Y (atomic mass = 16) combine to give a compound having 75.8% of X. The formula of the compound is:a)X2Y3b)X2Yc)X2Y2d)XYCorrect answer is option 'A'. Can you explain this answer?
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