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irinina [24]
2 years ago
10

Quest

Chemistry
2 answers:
Sever21 [200]2 years ago
8 0

Answer:

D. An acid accepts an electron pair from a base.

Explanation:

acorroding to lewis

  • an acid is a compound which accepts a pair of electrons from base .

  • a base is a compound which donates a pair of electron to acid .
stepladder [879]2 years ago
3 0
I think the answer is D !!!!!!!!
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You are given a sample of limestone, which is mostly CaCO3, to determine the mass percentage of Ca in the rock. You dissolve the
irakobra [83]

Answer:

34.15% is the mass percentage of calcium in the limestone.

Explanation:

Mass of precipitate that is calcium oxalate = 140.2 mg = 0.1402 g

1 mg = 0.001 g

Moles of calcium oxalate = \frac{0.1402 g}{128 g/mol}=0.001095 mol

1 mole of calcium oxalate have 1 mole of calcium atom.

Then 0.001095 moles of calcium oxalate will have 0.001095 moles of calcium atom.

Mass of 0.001095 moles of calcium :

0.001095 mol × 40 g/mol = 0.04381 g

Mass of sample of limestone = 128.3 mg = 0.1283 g

Percentage of calcium in limestone:

\frac{0.04381 g}{0.1283 g}\times 100=34.15\%

34.15% is the mass percentage of calcium in the limestone.

7 0
3 years ago
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2 years ago
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A sample of hydrogen occupies a volume of 351 mL at a temperature of 20 degrees Celsius. What is the new volume if the temperatu
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Volume of Hydrogen V1 = 351mL 
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