Answer:
35.48 uma
Explanation:
An isotope is when an element has equal numbers of protons but different mass value because it has different amount of neutrons.
To calculate the average atomic mass with the given data:
First change de percentages to fractional numbers, divide by 100.
Remember the sum of a percentage is equal to 100, but when you are adding the fractions the sum is equal to 1.
76/100 = 0.76
24/100 = 0.24
% fraction
76.00 0.76
24.00 0.24
total100.00 1.00
Now, multiply the mass with their corresponding fraction:
35(0.76) = 26.60
37(0.24) = 8.88
% fraction amu amu
76.00 0.76 35 26.60
24.00 0.24 37 8.88
total100.00 1.00 average 35.48
Now you add the calculated mass to obtain the average atomic mass of the element.
And the value you will get is 35.48 amu.
I included an excel table so you can review it, I like to organize all the given data and the calculation in tables, also I think is easier to understand.
So in this task first I think you should use the formula of the: Density/percentage
68.8% divided 26.2%= 2.625954198473282
2.625954198473282 X =
13.12977099236641
Answer:
a,c are correct
Explanation:
a) On mixing two gases the final temperature of both the gases becomes the same. The heat will flow from high temp. gas to lower temp gas till the temp of both gases become equal (Thermal equilibrium). This is correct.
b) The rms speed of the molecule is inversely proportional to its molar mass so the final rsm will not be the same. This is incorrect.
c) The average kinetic energy of the system will remain the same. Hence this is also correct.
2C3H7OH + 9O2 → 6CO2 + 8H2O
Answer:
After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.
Explanation:
The first order kinetics reaction is:
ln [A] = ln [A]₀ - kt
<em>Where [A] is concentration after t time, [A]₀ is intial concentration and k is reaction constant.</em>
To convert half-life to k you must use:
t(1/2) = ln 2 / K
221s = ln 2 / K
K = ln 2 / 221s
<h3>K = 3.1364x10⁻³s⁻¹</h3>
If [A] = 1/64, [A]₀ = 1:
ln [A] = ln [A]₀ - kt
ln (1/64) = ln 1 - 3.1364x10⁻³t
4.1588 = 3.1364x10⁻³s⁻¹t
1326s = t
<h3>After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.</h3>
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