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stepladder [879]
3 years ago
6

What is the mass in grams of 0.375 mol if the element potassium, k?​

Chemistry
2 answers:
Burka [1]3 years ago
8 0

Answer:

14.625g

Explanation:

Mass of a substance =number of moles of the substance × molar mass of the substance

Substance of interest is potassium, K

Given, Number of moles of K =0.375mol

Molar mass of K =39g/mol

Therefore, mass of K =0.375×39=14.625g

alexandr402 [8]3 years ago
3 0

Answer: 14.625g

Explanation:

No of moles= mass given/molar mass

No of moles given= 0.375mol

Mass is the unknown (?)

Molar mass of K= 39

No of moles = mass given/molar mass

Substitute the values

0.375= mass/39

Cross multiply

Mass = 39×0.375

Mass= 14.625g

The mass is 14.625g

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Answer:

K2 = 61.2 M^-1.S^-1

Explanation:

We complete the question fully:

The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy Ea = 71.0kJ/mol . If the rate constant of this reaction is 6.7M^(-1)*s^(-1) at 244.0 degrees Celsius, what will the rate constant be at 324.0 degrees Celsius?

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          Ea  = activation energy

             R = gas constant

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From the equation, the following was derived for a double temperature problem:

ln(k2/k1) = (-Ea/R) * (1/T1 - 1/T2)

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      T1= (244 + 273.15) K = 517.15 K

      T2= (324+ 273.15) K =597.15 K

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ln(k2/6.7) = (-71000/8.314) * (1/517.15 - 1/597.15)

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K2 = e^(4.114)

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