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Inessa [10]
3 years ago
6

When sodium and oxygen react to form an ionic compound, the mass of the compound ____ the sum of the masses of the individual el

ements.
is less than
is greater than
is equal to
can be greater than or less than
Chemistry
2 answers:
Anna007 [38]3 years ago
5 0
Hi Lara

The answer is : C

Is equal to


I hope that's help!
mylen [45]3 years ago
5 0

Answer: Less than

Chemical reactions involve a separation, combination, or rearrangement of atoms.

During a chemical reaction which involves breaking and making a bond some amount of matter is destroyed some are converted to energy. Hence, when sodium and oxygen react to form an ionic compound, the mass of the compound is less the sum of the masses of the individual elements

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The following data is given to find the formula of a Hydrate:
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The masses can be found by substractions:

  • Mass of CaSO₄.H2O (hydrate):

16.05 g - 13.56 g = 2.49 g

  • Mass of CaSO₄ anhydrate:

15.07 g - 13.56 g = 1.51 g

  • The mass of water is equal to the difference between the mass of the hydrate and the mass of the anhydrate:

2.49 g - 1.51 g = 0.98 g

  • The percent of water is found by the formula:

massWater ÷ massHydrate * 100%

0.98 g ÷ 2.49 g * 100% = 39.36%

  • The mole of water is calculated using water's molecular weight (18g/mol):

0.98 g ÷ 18 g/mol = 0.054 mol water

  • A similar procedure is made for the mole of salt (CaSO₄ = 136.14 g/mol)

1.51 g ÷ 136.14 g/mol = 0.011 mol CaSO₄

  • The ratio of mole of water to mole of anhydrate is:

0.054 mol water / 0.011 mol CaSO₄ = 0.49

In other words the molecular formula for the hydrate salt is CaSO₄·0.5H₂O

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3 years ago
If more solute can be dissolved in a solvent, the solution is
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Answer: B. Unsaturated

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Explanation:

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