3 years ago

Is the Hertzsprung-Russell diagram still a valid instrument in studying stars, given that it is over 100 years old?

Chemistry

2 answers:

svet-max [94.6K]3 years ago

8 0

Answer:

Yes.

Explanation:

Hello,

As long as it shows important relationships between the size and color of stars, age wouldn't affect observation and measurement but will just provide more accurate results but the method is still valid.

Best regards.

klemol [59]3 years ago

8 0

Answer:

Yes, because it is still relevant today.

Explanation:

It shows the coloration of stars with each other, the brightness and all.

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What is the concentration of 60 mL of H3PO4 if it is neutralized by 225 mL of 2 M Ba(OH)2?

goldfiish [28.3K]

7.5 M is the concentration of 60 ml of H3PO4 if it is neutralized by 225 ml of 2 M Ba(OH)2.

Explanation:

Data given:

volume of phosphoric acid, Vacid =60 ml

volume of barium hydroxide, Vbase = 225 ml

molarity of barium hydroxide, Mbase = 2M

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the formula for titration is used as:

Macid x Vacid = Mbase x Vbase

rearranging the equation to get Macid

Macid = $\frac{Mbase x Vbase}{Vacid}$

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Macid = 7.5 M

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