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Leto [7]
2 years ago
10

Which event takes place first in the stages before the birth of a star?

Biology
1 answer:
padilas [110]2 years ago
7 0

Answer: The contracting cloud is then called a protostar. A protostar is the earliest stage of a star's life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts.

Explanation:

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You are required to make 10mL of a 0.5M solution of HCl. Your stock solution of HCl is 90M. Using distilled water (dH2O) as a so
sleet_krkn [62]

Answer:

0.0556 mL of 90 M HCl would be taken and 9.944 mL distilled water added to make 0.5 M, 10 mL HCl solution.

Explanation:

From the dilution equation:

<em>Initial molarity (m1) x initial volume (v1) = final molarity (m2) x final volume (v2).</em>

In this case, m1 = 90 M, v1 = ?, m2 = 0.5 M, and v2 = 10 mL

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This means that the initial volume of 90 M HCl to be taken is 0.0556 mL. Since the final volume to be prepared is 10 mL,

 10 - 0.0556 = 9.944 mL

<em>Hence, 0.0556 mL of 90 M HCl would be taken and 9.944 mL distilled water added to make 0.5 M, 10 mL HCl solution.</em>

<em />

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