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sp2606 [1]
3 years ago
11

5. By approximately what factor would the mass of a sample of copper-66

Chemistry
2 answers:
Fed [463]3 years ago
7 0
That’s picture right there should help u with your works

kykrilka [37]3 years ago
3 0

Answer:

99.9028% consumed with 0.0972% remaining

Explanation:

A = A₀e⁻^kt

k = 0.693/t₀.₅ = (0.693/5.1)min⁻¹ = 0.136 min⁻¹

Let ...

'A₅₁' = Remaining activity at time = 51 minutes

'A₀' = 1.00

A₅₁ = 1.00e⁻⁽⁰°¹³⁶⁾⁽⁵¹⁾ = 0.000972 => 0.0972% remaining

=> 100% - 0.0972% = 99.9028% consumed

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marusya05 [52]
10.1  grams of potassium nitrate, <span>10.1/50= 0.202</span>
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How many protons and electrons are contained in an<br> atom of element 44?
vitfil [10]

Answer:

44

Explanation:

protons and electrons have the same number:)

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A turtle moves at a speed of 1.0km/h. How fast is the turtle moving in meter per second
e-lub [12.9K]

Answer:

The speed of the turtle is 9.41 centimeters per second.

Explanation:

Speed of small turtle = 566 furlong/fortnight

1 furlong = 20,116.8 cm

1 fortnight = 1,209,600 seconds

Speed of small turtle in centimeter per seconds:

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Explanation:

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3 years ago
A 1.40 L sample of O2 at 645 Torr and 25 °C, and a 0.751 L sample of N2 at 1.13 atm and 25 °C, are both transferred to the same
anyanavicka [17]

Answer:

  • P(O₂) = 0.595 atm
  • P(N₂) = 0.424 atm
  • Total Pressure = 1.019 atm

Explanation:

To solve this problem we use PV=nRT for both gases in their containers, in order to <u>calculate the moles of each one</u>:

  • O₂:

645 Torr ⇒ 645 /760 = 0.85 atm

25°C ⇒ 25 + 273.16 = 298.16 K

0.85 atm * 1.40 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ *298.16 K

n = 0.0487 mol O₂

  • N₂:

1.13 atm * 0.751 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ *298.16 K

n = 0.0347 mol N₂

Now we can <u>calculate the partial pressure for each gas in the new container</u>, because the number of moles did not change:

  • O₂:

P(O₂) * 2.00 L = 0.0487 mol O₂ * 0.082 atm·L·mol⁻¹·K⁻¹ *298.16 K

P(O₂) = 0.595 atm

  • N₂:

P(N₂) * 2.00 L = 0.0347 mol N₂ * 0.082 atm·L·mol⁻¹·K⁻¹ *298.16 K

P(N₂) = 0.424 atm

Finally we add the partial pressures of all gases to <u>calculate the total pressure</u>:

  • Pt = 0.595 atm+ 0.424 atm = 1.019 atm
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Two tectonic plates under water move apart, and magma fills the space between them. This is an example of
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