Answer:
26.6 s.
Explanation:
For a zero order kinetics, the formula is:
[A] = [A₀] - kt
where,
[A] = amount pr concentration left
[A₀] = initial concentration or amount
k = rate constant
t = time
concentration = mole/volume
[A₀] = 0.5/2.0
= 0.25 M
[A] = 0.25/2.0
= 0.125 M
k = 0.0047 Ms⁻¹
t = ([A] - [A₀]/-k
= (0.125 - 0.25)/(-0.0047)
= 26.60 s.
the amount is reduced by half after 26.6 seconds
Answer:
Explanation:
There are two main types of ocean currents: currents driven mainly by wind and currents mainly driven by density differences. Density depends on temperature and salinity of the water. Cold and salty water is dense and will sink. Warm and less salty water will float.
There are 2 Nitrogen atoms (or parts) of Nitrogen on the left side of the equation, and 2 Hydrogen, and only one Nitrogen but three Hydrogen on the other side. Where did the extra Nitrogen go? Where did that Hydrogen come from? The answer is Stoichiometry.
N2 + H2 --> NH3 has to be balanced, so we add coefficients to the reactants and products, which indicate in what ratio they are consumed in the reaction. They effectively multiply the subscripts on the elements.
To balance Nitrogen, we have to add a 2 to the front of NH3, so we get 2NH3. Nitrogen is balanced, but Hydrogen isn't. There are now 6 Hydrogen being produced by the reaction, so we can add a 3 to the products side, making 3H2.
Now we have N2 + 3H2 --> 2NH3, and everything is balanced.
The ratio is 2:6, or 1:3
Answer:
A. No; B. yes
Explanation:
A. Mass
The balloons contain different gases, which will have different densities.
Mass = volume × density
m = V × D
However, the volume is the same for all three balloons.
Thus m = kD
And the mass of the gas is directly proportional to the density.
Since the density varies, the mass varies.
B. Number of molecules
This is Avogadro's Hypothesis:
At the same conditions of temperature, equal volumes of gases contain the same number of molecules.
