12. Which of these is a solution? *
2 answers:
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Answer : Yes , H2SO4 is an arrhenius acid <h2>Explanations : </h2>
• An ,Arrhenius acid ,is a substance that ,dissociates, in water to form ,hydrogen ions (H+).
,• In other words, an arrhenius acid increases the H+ ion concentration in aqueous solution.
,• This can be represented by the equation :
• Therefore, H2SO4 is a strong arrhenius acid.
Answer:
The activity of 50mg of Sr is
Explanation:
Every nuclear disintegration follows the first order rate, thus the half-life (t1/2) is where k is the constant of the reaction.
<em>Considering 1 year equals 3.15x107 seconds</em>
For Sr with t1/2 = , the constant of the reaction is
The activity (A) of a nucleus is where N is the number of nucleus. Sr molecular mass is 87.6g/mol and every mol contains 6.023x1023 atoms, thus
Therefore, the activity of 50mg of Sr is