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AysviL [449]
3 years ago
13

Oxygen-15, used in imaging brain function and blood flow, has a half-life of 2 min. How many half-lives have occurred in the 10

min it takes to prepare the sample?
Chemistry
1 answer:
marin [14]3 years ago
8 0

Answer:

Number of half lives = 5

Explanation:

Given data:

Half life of oxygen = 2 min

Half lives occured in 10 min = ?

Solution:

Formula;

Number of half lives = Time elapsed / half life

by putting values,

Number of half lives = 10 min / 2 min

Number of half lives = 5

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Calculate the molarity of 32.9 g32.9 g of MgS MgS in 971 mL 971 mL of solution.
Doss [256]

Answer:

0.60 M

Explanation:

Given data:

Mass of MgS = 32.9 g

Volume of solution = 971 mL (0.971 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of MgS:

Number of moles = mass/molar mass

Number of moles = 32.9 g/ 56.38 g/mol

Number of moles = 0.58 mol

Molarity of solution:

M = 0.58 mol/ 0.971L

M = 0.60 M

6 0
3 years ago
From which sublevel are electrons removed when a zn atom in the ground state is oxidized?
Vesnalui [34]

Answer:

4s2

Explanation:

The electronic configuration of zinc in the ground state of the atom is 1s22s22p6 3s23p63d104s2. It can be written in a condensed form by showing the inert gas core as follows; [Ar] 3d¹⁰ 4s².

Zinc has a pseudo inert gas configuration when the 4s electrons are removed during oxidation. Hence this sublevel is usually affected when zinc atoms are oxidized according to the scheme;

Zn---->Zn^2+ + 2e-

5 0
3 years ago
What's Meso compounds? Please explain it to me with an appropriate example. I'll mark you as Brainliest ​
slamgirl [31]

Answer:

this can be explained as a non optically active member of a set of stereoisomer, at least two of which are optically active

Explanation:

this means that despite containing two or sterogeonic center the molecules are not chiral

example:

the example above shows at least two choral center and internal mirror plane

4 0
4 years ago
Help asap thank u!!!!
9966 [12]
I think the answer is the last answer at the bottom
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