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Radda [10]
3 years ago
7

Phosphoric acid, which is a component of many soft drinks, has a molar mass of 98.00 grams per mole. A sample of phosphoric acid

contains 3.1 percent hydrogen, 31.6 percent phosphorus, and 65.3 percent oxygen by mass. What is the molecular formula of phosphoric acid
Chemistry
1 answer:
sladkih [1.3K]3 years ago
5 0

Answer:

H_{3} PO_{4}

Explanation:

We start this question by assuming we have 100 g of phosphoric acid. Based on the percentages, this means 3.1 g of it is hydrogen, 31.6 g of it is phosphorus and 65.3 of it is oxygen. Now we can calculate the empirical formula

H : 3.1/1.008 = 3.075 ≈ 3

P : 31.6/30.97 = 1.020 ≈ 1

O : 65.3/15.99 = 4.08 ≈ 4

This would mean that its formula is H3PO4 which has a relative molecular mass of 3 (1.008) + 1(30.97) + 4(15.99) =  97.954. Since the empirical molecular mass is equal to the molar mass of this substance in grams, then we have found the molecular mass

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8 0
2 years ago
N2 +3H2 → 2NH3 What volume of ammonia at STP is produced if 30.0 g of nitrogen gas is reacted with an excess of hydrogen gas?
WARRIOR [948]

Answer:

V= 48L

Explanation:

Moles of N2 = m/M = 30/28= 1.07moles

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3 0
4 years ago
Look at sample problem 18.15 in the 8th ed Silberberg book. Identify the Lewis acids and Lewis bases in the following reactions:
Lelechka [254]

Answer:

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H+ is a Lewis acid

OH- is a Lewis base

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K+ is a Lewis acid

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Explanation:

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Potassium ion accept electron pairs from 6 water molecules which donate the electron pairs.

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3 years ago
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Two answer multiple-choice-- please help!
Troyanec [42]

Answer:

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