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Margarita [4]
3 years ago
11

The time required for one-half of the atoms from a sample of a radioactive substance to decay is called its _____.

Chemistry
2 answers:
Orlov [11]3 years ago
8 0
A.) half - life of a radioactive substance is defined as the time during which concentration of the substance becomes half the initial value.
Angelina_Jolie [31]3 years ago
5 0

Answer:

The answer is A. Half-life Hope this helps!

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3 years ago
The balanced equation for combustion in an acetylene torch is shown below:
vichka [17]

Answer:

70mol

Explanation:

The equation of the reaction is given as:

                  2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

Given parameters:

Number of moles of acetylene = 35.0mol

Number of moles of oxygen in the tank = 84.0mol

Unknown:

Number of moles of CO₂ produced = 35.0mol

Solution:

From the information given about the reaction, we know that the reactant that limits this combustion process is acetylene. Oxygen is given in excess and we don't know the number of moles of this gas that was used up. We know for sure that all the moles of acetylene provided was used to furnish the burning procedure.

To determine the number of moles of CO₂ produced, we use the stoichiometric relationship between the known acetylene and the CO₂ produced from the balanced chemical equation:

From the equation:

         2 moles of acetylene produced 4 moles of CO₂

          ∴ 35.0 mol of acetylene would produced:  

                               \frac{35 x 4}{2} = 70mol

6 0
3 years ago
Read 2 more answers
Name the two molecules Nн нннн
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Answer:

1: C5H12

2:C5H11

Explanation:

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