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Anna007 [38]
3 years ago
8

How is life on Earth affected by Earth's revolution around the Sun

Chemistry
1 answer:
kolezko [41]3 years ago
3 0
Some laces get warm and some get cold
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How many CH4 molecules are in 14.8 g of CH4
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Why are the average atomic masses of some of the elements in parentheses?
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4 0
4 years ago
A 35.40 gram hydrate of sodium carbonate, Na2CO3•nH2O, is heated to a constant mass. Its final weight is 30.2 g. What is formula
Sever21 [200]

Answer:

Na₂CO₃•H₂O

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After it is heated, the remaining mass is the mass of sodium carbonate.

30.2 g Na₂CO₃

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35.4 g − 30.2 g = 5.2 g H₂O

Convert masses to moles:

30.2 g Na₂CO₃ × (1 mol Na₂CO₃ / 106 g Na₂CO₃) = 0.285 mol Na₂CO₃

5.2 g H₂O × (1 mol H₂O / 18.0 g H₂O) = 0.289 mol H₂O

Normalize by dividing by the smallest:

0.285 / 0.285 = 1.00 mol Na₂CO₃

0.289 / 0.285 = 1.01 mol H₂O

The ratio is approximately 1:1.  So the formula of the hydrate is Na₂CO₃•H₂O.

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3 years ago
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