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zhannawk [14.2K]
3 years ago
13

What type of star has an absolute brightness of 1 and a surface temperature of around 7,500 °C?

Chemistry
2 answers:
Drupady [299]3 years ago
8 0
I think it is B. Giant
Hope this helps good luck
Morgarella [4.7K]3 years ago
7 0
I believe the answer would be b giant
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Calculate the ph of a solution whose(oh^-) is 4.583*10^-5 mole dm cube (pkw=14)​
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pH of solution = 9.661

<h3>Further explanation </h3>

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

pOH=-log[OH⁻]

\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339

pH+pOH=pKw

\tt pH=14-4.339\\\\pH=9.661

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