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Orlov [11]
3 years ago
6

The half-life of plutonium-238 is 87.7 years.

Chemistry
2 answers:
Margaret [11]3 years ago
8 0

Answer:

263.1 is exactly three half-life, so the remaining portion is (1/2 x 1/2 x 1/2) of the original sample. That's 1/8 which is 12.5%

kobusy [5.1K]3 years ago
6 0

Answer:

12.5 87.5

Explanation:

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Hey there!:

The hydroxyl groups act to neutralize the sodium borohydride which reduces yield.


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6 0
3 years ago
If 100.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your
Drupady [299]

N₂ : limiting reactant

H₂ : excess reactant

<h3>Further explanation</h3>

Given

mass of N₂ = 100 g

mass of H₂ = 100 g

Required

Limiting reactant

Excess reactant

Solution

Reaction

<em>N₂+3H₂⇒2NH₃</em>

mol N₂(MW=28 g/mol) :

\tt mol=\dfrac{mass}{MW}=\dfrac{100}{28}=3.571

mol H₂(MW= 2 g/mol) :

\tt mol=\dfrac{100}{2}=50

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactans become a limiting reactants

From the equation, mol ratio N₂ : H₂ = 1 : 3, so :

\tt \dfrac{3.571}{1}\div \dfrac{50}{3}=3.571\div 16.6

N₂ becomes a limiting reactant (smaller ratio) and H₂ is the excess reactant

5 0
3 years ago
Classify each of the following as a combination, decomposition, single replacement, double replacement, or combustion reaction:
hjlf

Answer:

1) single replacement

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3) double replacement reaction

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5) decomposition reaction

Explanation:

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Fe₂CO₃ + 3C  →   2Fe + 3CO

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The given reaction is combustion reaction. In which ethene burn in the presence of oxygen form carbon dioxide and water.

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Chemical equation:

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The given reaction is combination reaction in which aluminium and bromine combine to form aluminium bromide.

Chemical equation:

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7 0
3 years ago
Gold and silver are used to make coins and medals<br>​
Anastaziya [24]
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2. In the scientific name Limus polyphemus, which classification group is
grandymaker [24]

Answer:

A

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