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3 years ago

2Mg + O2 = 2MgO. Magnesium is the limiting reactant if 2.5g of magnesium is reacted how much magnesium oxide is made ?

Chemistry

1 answer:

makvit [3.9K]3 years ago

8 0

The answer for the following problem is mentioned below.

Therefore; if 2.5g of magnesium is reacted then 4.16 grams of magnesium oxide is reacted.

Explanation:

Given:

mass of magnesium = 2.5 grams

We know;

molar mass of magnesium (Mg) = 24 grams

molar mass of magnesium oxide (MgO) =24 +16 = 40 grams

2Mg + O2 → 2MgO

2×24 2×40

If;

2×24 grams of Mg → 2×40 grams of MgO

Then;

2.5 grams of Mg → ?

= (2×40 × 2.5 ) ÷ 2×24

= 4.16 grams

Therefore; if 2.5g of magnesium is reacted then 4.16 grams of magnesium oxide is reacted.

So therefore 4.16 grams of magnesium oxide is made.

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2 years ago

Calculate the concentration of OH- in a solution that contains 3.9 x 10-4 M H3O+ at 25°C. Identify the solution as acidic, basic

aalyn [17]

Answer:

[OH⁻] = 2,6x10⁻¹¹

Acidic

Explanation:

The kw in water is:

2 H₂O(l) ⇄ OH⁻(aq) + H₃O⁺(aq)

kw = [OH⁻] [H₃O⁺] = 1,00x10⁻¹⁴

If concentracion of H₃O⁺ is 3,9x10⁻⁴M:

[OH⁻] [3,9x10⁻⁴M] = 1,00x10⁻¹⁴

[OH⁻] = 2,6x10⁻¹¹

pH is defined as - log[H₃O⁺]. If pH>7,0 the solution is basic, if pH<7,0 solution is acidic, if pH=7,0 solution is neutral.

In this problem,

pH = - log [3,9x10⁻⁴M] = 3,4

As pH is < 7.0, the solution is acidic

I hope it helps!

8 0

3 years ago

The chemical formula for table sugar is C12H11O22. What can you tell from this formula?

just olya [345]

I say the answer is The ratio of oxygen atoms to hydrogen atoms in a molecule of sugar is 2 to 1

7 0

3 years ago

Read 2 more answers

Determine whether each carbohydrate is best described as a monosaccharide, a disaccharide, or a polysaccharide

vazorg [7]

Answer options from an alternative source

fructose
lactose
starch
glucose
cellulose

Answer:

fructose -monosaccharide
lactose - disaccharide
starch - polysaccharide
glucose - monosaccharide
cellulose - polysaccharide

Explanation:

Monosaccharides are carbohydrates that are the simplest form of a sugar. They cannot be further broken down into smaller carbohydrates, and represent the basic building block for carbohydrates. Monosaccharides can form disaccharides, which are the sugar formed when two monosaccharides join together, or polysaccharides, which are chains of monosaccharides.

3 0

3 years ago

What is the pH of a solution with an [H+] = 4.73x10^-7 M

Mice21 [21]

Answer:

The answer to your question is pH = 6.3

Explanation:

Data

pH = ?

[H⁺] = 4.73 x 10⁻⁷ M

pH is the measure of the concentration of [H⁺]. pH measures the acidity of the solution. If the value of pH is between 0 and 6.9, the solution is an acid. If the pH is 7.0 the solution is neutral and if the pH is between 7.1 and 14, the solution is an alkali.

Formula

pH = -log[H⁺]

Substitution

pH = -log[4.73 x 10⁻⁷]

-Simplification

pH = - (-6.3)

-Result

pH = 6.3

6 0

3 years ago