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3 years ago

Manganese-56 is a beta emitter with a half-life of 2.6 hours. What is the mass of

Chemistry

2 answers:

Arisa [49]3 years ago

8 0

Answer:

0.0009765625

Explanation: u just keep doing a half life till it goes to 13 aka

8.0g divided by 2 till you reach to 13 times of a half life ;p

dlinn [17]3 years ago

6 0

Answer:

Explanation:

Answer:

Explanation:Answer:

Explanation:

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When copper metal is added to nitric acid, the following reaction takes place

zlopas [31]

Answer:

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

Explanation:

$Cu (s) + 4 HNO_3 (aq) \rightarrow Cu(NO_3)_2 (aq) + 2 H_2O (l) + 2 NO_2 (g)$

Moles of copper = $\frac{2.01 g}{63.55 g/mol}=0.03163 mol$

According to reaction, 1 mol of copper gives 2 moles of nitrogen dioxide gas.

Then 0.03613 moles of copper will give:

$\frac{2}{1}\times 0.03163 mol=0.06326 mol$ of nitrogen dioxide gas

Moles of nitrogen dioxide gas = n = 0.06326 mol

Pressure of the gas = P

P = Total pressure - vapor pressure of water

P = 726 mmHg - 23.8 mmHg = 702.2 mmHg

P = 0.924 atm (1 atm = 760 mmHg)

Temperature of the gas = T = 25.0°C =298.15 K

Volume of the gas = V

$PV=nRT$

$V=\frac{0.06326 mol\times 0.0821 atm L/mol K\times 298.15 K}{0.924 atm}$

V = 1.68 L

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

3 0

3 years ago

Read the following hypothesis about why a chicken bone becomes bendy after being soaked in vinegar: The bone can bend because th

Genrish500 [490]

Answer:

D. If the acid was separated from the vinegar, chicken bones wouldn't become bendy in the remaining vinegar.

Explanation:

The hypothesis states that the bone becomes bendy because of the acid in the vinegar, so therefore, if the acid is removed from the vinegar it won't become bendy.

7 0

3 years ago

Read 2 more answers

The amplitude of a wave is most directly related to what wave characteristic? Crest length

galina1969 [7]

The amplitude of a wave is most directly related to crest length.

Amplitude means the height of a crest or a trough.

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3 years ago

The scientist at the weather office predicted the temperatures in the city route route for the next week I will be the weather t

Cloud [144]

Answer:

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Explanation:

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3 years ago

Why is the current model of the atom considered to be most accurate

olga_2 [115]

Answer:

It is the most recent idea of the atom and it is proved to be true

Explanation:

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3 years ago