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fgiga [73]
2 years ago
12

Which choice correctly describes the subatomic particles in the isotope 44ca?

Chemistry
1 answer:
Ksenya-84 [330]2 years ago
7 0

Answer:

20 protons, 20 electrons and 24 neutrons

Explanation:

In isotopes, the number of neutrons change, changing the mass number (of the atom)

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A student wants to make 100 mL of 0.30 M HCl. How many milliliters of 6.0 M HCl is needed to make this solution
sveticcg [70]

Answer:

5mL of 6 M HCl is needed to make 100 mL of 0.3 M of HCl.

Explanation:

Using the dilution formula:

M1V1 = M2V2

M1 = 0.30 M

V1 = 100 mL

M2 = 6.0 M

V2 = unknown

Re-arranging the formula by making V2 the subject of the equation:

V2 = M1V1 / M2

V2 = 0.30 * 100 / 6

V2 = 5 mL

The volume of 6 M of HCl needed to make 0.3 M at 100 mL is 5 mL.

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