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3 years ago

Which of the following is not the same as 8,540 centigrams?

Chemistry

2 answers:

Dahasolnce [82]3 years ago

8 0

8.54 Probably a little too late but, hey better late than never lol

Mila [183]3 years ago

4 0

Missing question:

0.0854 kilogram

85.4 grams

8.54 hectograms

85,400 milligrams.

Answer is: 8.54 hectograms is not the same.

1 cg = 0.01 g; one centigram is equal to 10⁻² grams.

m = 8540 cg.

m = 8540 cg · 0.01 g/cg.

m = 85.4 g.

1) m = 0.0854 kg.

1 kg = 1000 g.

m = 0.0854 kg · 1000 g/kg.

m = 85.4 g; it is the same.

2) m = 85.4 g; it is the same.

3) m = 8.54 hg.

1 hg = 100 g; one hectogram is 100 grams.

m = 8.54 hg · 100 g/hg.

m = 854 g; it is not the same.

4) m = 85400 mg.

1 mg = 0.001 g.

m = 85400 mg · 0.001 g/mg.

m = 85.4 g; it is the same.

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Answer:

reduction at electrode B

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4 years ago

A solution has a pH = 4.63. What is the [H3O+] concentration?

LUCKY_DIMON [66]

Explanation:

The pH of a solution can you be found by using the formula

$pH = - log [ { H_3O}^{+}]$

Since we are finding the [H3O+] , substitute the value of the pH and find it's antilog

We have

$4.63 = - log[ { H_3O}^{+}] \\ [ { H_3O}^{+}] = {10}^{ - 4.63} \\ \\ = 2.344 \times {10}^{ - 5} mol {dm}^{ - 3}$

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7 0

3 years ago

Why does the dilution equation, M 1 V 1 = M 2 V 2, work?

valentina_108 [34]

Answer:

d) The dilution equation works because the number of moles remains the same.

Explanation:

Let’s say that you have 1 mol of a solute in I L of solution. The concentration is 1 mol·L⁻¹. and M₁V₁ = 1 mol.

Now, you dilute the solution to a volume of 2 L. You still have 1 mol of solute, but in 2 L of solution. The new concentration is 0.5 mol·L⁻¹.

The volume has doubled, but the volume has halved, and M₂V₂ = 1 mol.

b) Wrong. The molar concentration changes on dilution.

c) Wrong. The volume changes on dilution.

a) Wrong, although technically correct, because if the moles don’t change, the mass doesn’t change either. However, the formula M₁V₁ has units mol·L⁻¹ × L = mol. Thus, in the formula, it is moles that are constant.

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4 years ago

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Answer:

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Explanation:

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3 years ago

Consider the reaction of 35.0 g of iron as follows:

77julia77 [94]

Explanation:

4Fe + 3O2 --> 2Fe2O3

Mass of iron = 35g

How many moles of iron react?

The relationship between mass and moles is given as;

Moles = mass / Molar mass

Molar mass of iron = 56g/mol

Number of moles = 35 / 56 = 0.625 mol

How many moles of oxygen molecules must react?

From the equation of the reaction;

4 mol of Fe reacts with 3 mol of Oxygen molecule

0.625 mol would react with x mol?

4 = 3

0.625 = x

x = 0.625 * 3 / 4 = 0.46875 mol

How many moles of product form?

From the equation of the reaction;

4 mol of Fe reacts to form 2 mol of Fe2O3

0.625 mol would form x mol of Fe2O3

4 = 2

0.625 = x

x = 0.625 * 2 / 4 = 0.3125 mol

What mass of product forms?

Moles = mass / Molar mass

Mass = Molar mass * Moles = 159.69 g/mol * 0.3125 mol = 49.9g

8 0

4 years ago