2 years ago

Americium-242 has a half-life of 6 hours. If you started with 24 g and you now have 3 g, how much time

1 answer:

7 0

How many times has it halved?

24/2 = 12
12/2 = 6
6/2 = 3

It halved three times.
It halves once every 6 hours.

18 hours have passed.

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What volume in L of a 0.724 M Nal solution contains 0.405 mol of Nal ?

Amanda [17]

Answer:

$0.5594\ \text{L}$

Explanation:

Mol of NaI = 0.405 mol

Molarity of solution = 0.724 M

Molarity is given by

$M=\dfrac{\text{mol}}{\text{Volume of solution in }NaI}\\\Rightarrow \text{Volume of solution in }NaI=\dfrac{0.405}{0.724}\\\Rightarrow \text{Volume of solution in }NaI=0.5594\ \text{L}$

The required volume is $0.5594\ \text{L}$ .

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2 years ago

¿Cuántos moles de aluminio (AI) se necesitan para formar 3,7 mol de Al2O3? 4Al(s) + 302 (g) -> 2A1203 (s)

tatuchka [14]

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2 years ago

Rhett is solving the quadratic equation 0= x2 – 2x – 3 using the quadratic formula. Which shows the correct substitution of the

bekas [8.4K]

The correct values I believe would be a=1 b=-2 and c=-3.

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1 year ago

In an experiment, 0.42 mol of co and 0.42 mol of h2 were placed in a 1.00-l reaction vessel. at equilibrium, there were 0.29 mol

Likurg_2 [28]

To determine the Keq, we need the chemical reaction in the system. In this case it would be:

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The Keq is the ration of the amount of the product and the reactant. We use the ICE table for this. We do as follows:

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I .42 .42 0
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-----------------------------------------------
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Therefore,

Keq = [CH3OH] / [CO2] [H2]^2 = 0.13 / 0.29 (0.16^2)
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2 years ago

Why does iron not fit the pattern in column 7

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