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Ede4ka [16]
3 years ago
13

(1.7 x 10-5 m) x (3.72 x 10-4 m) *

Chemistry
1 answer:
rosijanka [135]3 years ago
7 0

Answer:

The answer will be 1992/5 or 398.4

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The half-life for the radioactive decay of ce−141 is 32.5 days. if a sample has an activity of 3.8 μci after 162.5 d have elapse
Umnica [9.8K]
Answer : 121.5 <span>μCi

Explanation : We have Ce-141 half life given as 32.5 days so if the activity is 3.8 </span><span>μci after 162.5 days of time elapsed we have to find the initial activity.

We can use this formula;

</span>\frac{N}{ N_{0} } =  e^{-( \frac{0.693 X  T_{2} }{T_{1}})

3.8 / N_{0} = e^ ((0.693 X 162.5 ) / 32.5) = 121.5
<span>
On solving we get, The initial activity as 121.5  </span>μci
5 0
3 years ago
Read 2 more answers
Which has more atoms, 12.0 mol of C or 12.0 mol of Ca?​
mr_godi [17]

Answer:

they are equal.

Explanation:

1 mol = 6.022 × 10^23 (Avogadro's constant), which is the number of atoms in 1 mol of any element. Doesn't matter what their atomic mass is, although, of course, 1 mol of carbon weighs less than 1 mol of calcium, but its because their mass is different, but the point is, in 1 mol of any element there is 6.03*10^23 atoms

This is like saying, what weighs more, 10 kg of feathers or 10 kg of metal

6 0
2 years ago
List and describe the three rock types in the rock cycle including two or more processes involved in the formation of each type
Ludmilka [50]

Answer:    The three main rock types are igneous, metamorphic and sedimentary.

   The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.

   Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.

Explanation:

5 0
3 years ago
Which of the following statements about cell organelles is NOT true?
larisa [96]

B , because some organelles located in plant cells are not present in the animal cell

5 0
3 years ago
For the reaction of sodium bromide with chlorine gas
lina2011 [118]

The reaction of sodium bromide with chlorine gas is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

<h3>What is sodium bromide?</h3>

Sodium bromide is an inorganic compound, white, crystalline with high melting point.

The reaction between halogens is redox reaction

Oxidation  – 2Br⁻ ? Br₂ + 2e⁻ loss of electron.

Reduction – Cl₂ + 2e⁻ ? 2Cl⁻ gains of electron.

Thus, the correct option is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).

Learn more about sodium bromide

brainly.com/question/15409724

#SPJ4

7 0
2 years ago
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