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2 years ago

How to calculate magnitude of k

1 answer:

6 0

Use Arrhenius equation:
k = A*exp(-Ea/RT)
We have:
1.35x10^2/s = A*exp(-85600/(8.314*298.15))
or: A = 1.342x10^17/s
It is a piece of cake to calculate:
k = 1.342x10^17*exp(-85600/(8.314*348.15))
= 1.92x10^4/s

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Protactinium has 516 years of half life how many decays will it go through to become 1/64th of the substance? ,

Ulleksa [173]

Answer:

6 decays

Explanation:

Each half life period reduced the amount of substance by half

64 = 2⁶
1/64 = (1/2)⁶

So 6 of half life cycles or decays will go.

6 0

3 years ago

A sample of a given compound contains 13.18g of carbon and 3.32g of hydrogen. What is the percent composition of the compound?

GarryVolchara [31]

The percent composition of the compound is 79.87 % of carbon and 20.12% of hydrogen

Explanation:

Given:

mass of carbon = 13.18 grams

mass of hydrogen = 3.32 grams

percent composition of compound =?

From the given data total mass of the compound is calculated

13.8 + 3.32

= 16.5 grams

The individual percentage of hydrogen and carbon will be calculated as:

percent composition = $\frac{individual mass of the element}{total mass of the compound}$ x 100

For carbon,

$\frac{13.18}{16.5}$ x 100

percent composition of carbon = 79.87 % of carbon.

for hydrogen:

$\frac{3.32}{16.5}$

= 20.12 % of hydrogen

In the compound given 79.87 % of carbon and 20.12% of hydrogen is present.

8 0

3 years ago

True for a group of cells is called an organ

harina [27]

False. A group of cells is called a tissue.

6 0

3 years ago

1. A crane lifts a 75kg mass a height of 8 m. Calculate the gravitational potential energy

koban [17]

Answer:

GP.E = 5880 j

Explanation:

Given data:

Mass = 75 kg

height = 8 m

Potential energy = ?

Solution:

The formula for gravitational potential energy is

GPE = mgh

m = mass in kilogram

g = acceleration due to gravity

h = height in meter above the ground

Formula:

GP.E = mgh

Now we will put the values in formula.

g = 9.8 m/s²

GP.E = 75 Kg × 9.8 m/s²× 8 m

GP.E = 5880 Kg.m²/s²

Kg.m²/s² = j

GP.E = 5880 j

6 0

2 years ago

During a lab activity, students prepared two solutions separately at the same temperature. Later they mixed the solutions and th

Yuri [45]

The temperature dropped because B. energy was absorbed during the chemical reaction.
If energy was released, the temperature would rise. If there was no energy input, the temperature would stay the same. Since temperature dropped, it means that energy was absorbed.

6 0

3 years ago