3 years ago

In what two places minerals are form?

Chemistry

1 answer:

larisa [96]3 years ago

3 0

In earths surface or the bottom of the Ocean

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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.

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3 years ago

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Smh why do people always have to use fake profile pictures? Its not like anyone is gonna judge you it isnt facebook its a websit

agasfer [191]

Seriously though
people love to do that stuff .-.

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3 years ago

Given the following solutions: Solution A: pH of 10 Solution B: pH of 7 Solution C: pH of 5 Which list has the solutions placed

Butoxors [25]

Answer:

Explanation:

H+ is a representation of the number if hydrogen ions also known as acidity of a substance, it is well known that pH <7 represents acidity and acidity increases from 6 to 0. 7 i known as neutral, while 8-14 represents alkalinity/base. pH scale ranges from 0-14. pH 10, 7, 5 is the order of increasing H+.

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C3Hs + O2 = Co2 +H20

telo118 [61]

Answer:

algabra

Explanation:

air

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3 years ago

alex41 [277]

B

Please help

Sorry I need 20 characters to submit this Answer that’s why I’m adding more words

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