3 years ago

Use the following electron configuration given below to answer the following question.

Chemistry

1 answer:

NemiM [27]3 years ago

4 0

Answer:

mental

Explanation:

the element is vanadium, it is a Transition metal

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4. DBearded waste of Co-60 must be stored until it is no longer radioactive. Cobalt-60

Bingel [31]

464 g radioisotope was present when the sample was put in storage

<h3>Further explanation</h3>

Given

Sample waste of Co-60 = 14.5 g

26.5 years in storage

Required

Initial sample

Solution

General formulas used in decay:

$\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}$

t = duration of decay

t 1/2 = half-life

N₀ = the number of initial radioactive atoms

Nt = the number of radioactive atoms left after decaying during T time

Half-life of Co-60 = 5.3 years

Input the value :

$\tt 14.5=No.\dfrac{1}{2}^{26.5/5.3}\\\\14.5=No.\dfrac{1}{2}^5\\\\No=\boxed{\bold{464~g}}$

8 0

3 years ago

How many moles of HCl are present in 4.7 L of a 4.23 M HCl solution?

REY [17]

Hey There!

Volume = 4.7 L

Molarity = 4.23 M

Therefore:

n = M *V

n = 4.23 * 4.7

n = 19.881 moles of HCl

hope this helps!

6 0

3 years ago

The mass in g of 3 moles Al .

Damm [24]

Answer:

81 gm

Explanation:

The mass of 1 mole is 27 g

So, Mass of 3 moles of Aluminium would be 3 × 27 = 81 gm..Thus mass of 3 Moles of Aluminium is 81 gm.

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3 years ago

In a chemical change molecules DO NOT create or break chemical bonds to form a new substance you might be able to observe a chem

vesna_86 [32]

Answer:

false

Explanation:

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3 years ago

Which valid empercal formula below would have one. Five times as much oxygen as there is gold in the substance

stealth61 [152]

Answer:

Au2O3

Explanation:

See attachment.

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2 years ago