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3 years ago

Helppppppppppp please

Chemistry

2 answers:

sleet_krkn [62]3 years ago

6 0

Sorry, I’m only in 6th Grade, I don’t know this stuff.

Degger [83]3 years ago

4 0

Answer:

1. Option(1) 3

2. Option (2) 1/2

Explanation:

1. We'll begin by obtaining the molar mass of H3PO4. This is illustrated below:

Molar Mass of H3PO4 = (3x1) + 31 + (16x4) = 3 + 31 + 64 = 98g/mol

Mass of H in H3PO4 = 3x1 = 3g

The percentage by mass of H in H3PO4 given by:

Mass of H in H3PO4/Molar Mass of H3PO4 x 100

=> 3/98 x 100

=> 3

2. Atoms present in H3PO4 are given below:

H = 3 atoms

P = 1 atom

O = 4 atoms

Total = 8 atoms

The fraction of oxygen atom in H3PO4 is given by:

=> Atom of O/total atoms

=> 4/8

=> 1/2

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3 years ago

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mart [117]

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Explanation:

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3 years ago

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madreJ [45]

Answer:

$470\frac{KJ}{mol}$

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3 years ago