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Nikitich [7]
3 years ago
13

Perform the following

Chemistry
1 answer:
solmaris [256]3 years ago
6 0

Answer: The correct number of significant figures in 7.68 \times 4.564 is 35.05152.

Explanation:

Digits present in a number that helps in determining the degree of accuracy starting from the first non-zero digit is called a significant figure.

Some rules for significant figures are as follows.

  • All the digits present within the non-zero digits are considered in a number.

For example, 2085 contains 4 significant digits.

  • Leading zeros are not counted in a number.

For example, 0.0034 has 2 significant digits.

  • We count the trailing zeros when a decimal point is present in a number.

For example, 0.02500 has 4 significant figures.

  • When there is no decimal point then trailing zeros may or may not count.

For example, 19000 has 2 significant digits.

Now, the product of given digits is as follows.

7.68 \times 4.564 = 35.05152

Thus, we can conclude that correct number of significant figures in 7.68 \times 4.564 is 35.05152.

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2.1. The lithium ion in a 250,00 mL sample of mineral water was
juin [17]

Answer:

11482 ppt of Li

Explanation:

The lithium is extracted by precipitation with B(C₆H₄)₄. That means moles of Lithium = Moles B(C₆H₄)₄. Now, 1 mole of B(C₆H₄)₄ produce the liberation of 4 moles of EDTA. The reaction of EDTA with Mg²⁺ is 1:1. Thus, mass of lithium ion is:

<em>Moles Mg²⁺:</em>

0.02964L * (0.05581mol / L) = 0.00165 moles Mg²⁺ = moles EDTA

<em>Moles B(C₆H₄)₄ = Moles Lithium:</em>

0.00165 moles EDTA * (1mol B(C₆H₄)₄ / 4mol EDTA) = 4.1355x10⁻⁴ mol B(C₆H₄)₄ = Moles Lithium

That means mass of lithium is (Molar mass Li=6.941g/mol):

4.1355x10⁻⁴ moles Lithium * (6.941g/mol) = 0.00287g. In μg:

0.00287g * (1000000μg / g) = 2870μg of Li

As ppt is μg of solute / Liter of solution, ppt of the solution is:

2870μg of Li / 0.250L =

<h3>11482 ppt of Li</h3>

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3 years ago
Which best describes the process of igneous rock formation?
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Igneous rock formation is when magma from a volcano is spilled onto the earth's surface. When lava erupts onto the Earth's surface, it cools quickly creating an igneous rock.

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The empirical formula is C6H6O.vapour density is 47.find the molecular formula​
Andru [333]

Answer: The molecular formula will be C_6H_6O

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

The empirical formula is C_6H_6O

The empirical weight of C_6H_6O = 6(12)+6(1)+1(16) = 94 g.

The molecular weight = 2\times \text{vapour density}=2\times 47=94

Now we have to calculate the molecular formula.

n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{94}{94}=1

The molecular formula will be=1\times C_6H_6O=C_6H_6O

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