When this is the first order reaction of the radioactive decay:
and according to the first order rate equation:
㏑(Ao/A) = K t
and when Ao = is the starting concentration
and A = is the concentration at time t
and K is the rate constant
t is the elapsed time = 14.26 days
for 1 half-life ∴ Ao/A = 2
by substitution:
㏑2 = K * 14.26 days
∴ K = 0.0486 days^-1
Answer:
The hydronium ion concentration of the substance is 0,01 M.
Explanation:
The pH indicates the acidity or basicity of a substance. PH values between 0 and less than 7 indicate acidic solutions, 7 neutral and greater than 7 to 14 basic. It is calculated as
pH = -log (H 30+), and in this case we solve to calculate (H30 +):
(H30 +) = antilog -pH= antilog -2
<em>(H30+)=0,01 M</em>
The answer is black hole<span />
0.0018 grams is the mass of silver can 2 kJ of energy raise 15°C.
Explanation:
Data given:
heat supplied (q) = 2KJ or 2000 J
cp of silver= 0.24 j/gram °C (specific heat capacity is the amount of heat required to raise the temp of substance by 1 degree)
temperature = 15 degree centigrade
mass=?
using the equation for the heat capacity,
q= mcpT
m = 
Putting the values in the equation:
= 
= 0.0018 grams is the mass of silver in which 2 kJ of energy raise temperature by 15°C.
4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.
<h3>What is a mole ?</h3>
A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.
The equation for reaction of Nitrogen monoxide to form water vapor is given by
4NH₃ + 6NO ----> 5N₂ + 6H₂O
72 grams of water vapor means = 72/18 = 4 mole of water vapour
The mole fraction of NO to H₂O is 6 : 6
Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.
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