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vesna_86 [32]
3 years ago
8

Choose all that apply. Which of the following are not considered to be elements essential for life?

Chemistry
2 answers:
Basile [38]3 years ago
8 0
Al, Si, Mg
 All other elements seem more necessary in life

Advocard [28]3 years ago
4 0

aluminum and silicon are not essential for life

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What is the volume of an 2.3 solution with 212 grams of calcium chloride dissolved in it
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830 mL. A 2.3 mol/L solution of CaCl2 has a volume of 830 mL

I am guessing that the concentration of your solution is 2.3 mol/L.

a) Moles of CaCl2

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Moles of CaCl2 = 212 g CaCl2 x (1 mol CaCl2/110.98 g CaCl2)

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3 years ago
What volume. In liters, of H2O(g) measured at STP is produced by the combustion of 15.63 g of natural gas (CH4) according to the
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Answer:

V = 43.95 L

Explanation:

Given data:

Mass of CH₄ decomposed = 15.63 g

Volume of H₂O produced at STP = ?

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Chemical equation:

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Number of moles = 15.63 g/ 16 g/mol

Number of moles = 0.98 mol

Now we will compare the moles of H₂O with CH₄.

                         CH₄              :              H₂O

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                        0.98             :            2×0.98 = 1.96 mol

Volume of hydrogen:

PV = nRT

1 atm × V = 1.96 mol × 0.0821 atm.L/mol.K × 273.15 K

V = 43.95atm.L / 1atm

V = 43.95 L

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