Select the correct answer. What is the SI unit of time?
2 answers:
Option A: second
SI units are international system of units. This is defined as a system of units of physical quantities such as mass, length, temperature, current etc. Some of the physical units are gram, meter, second etc. along with the set of prefixes which indicates the multiplication and division with some power of 10.
For same physical quantities, these units are inter convertible For example,
and,
Here, g (gram), kg (kilogram) and mg (milligram) all are units of mass.
The units of time are second, minute, hour, day and year. Here, second is the SI unit and all the units are inter convertible as follows:
1 year=365 days
1 day=24 hours
1 hour=60 minutes
1 minute-60 seconds
Thus, the SI unit of time is second.
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<h2>1.25 g of 
would be produced from the complete reaction of 25 mL of 0.833 mol/L 
with excess 
</h2>
Explanation:
To calculate the number of moles for given molarity, we use the equation:
According to stoichiometry:
1 mole of will give = 1 mole of
0.0208 moles of will give =
of
Mass of
Thus 1.25 g of would be produced from the complete reaction of 25 mL of 0.833 mol/L
with excess
Learn more about molarity
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Here, we have to get the number of atoms present in the 100 plane of the FCC crystal lattice.
There will be 2 atoms in 100 plane of FCC crystal lattice.
In the face centered crystal (FCC) lattice there are atoms at each corner of the cube and each are shared by 4 another atoms. And an atom is present at the face of the crystal.
For the 100 plane of the Miller indices the intercepts are a, ∞, ∞ or 2a, ∞, ∞.
Thus, for the 4 atoms of the corner at the cube shared by 4 other atoms will contribute, 4 × = 1 and the un-shared atoms at the face will contribute another 1, which make the total atom 1 + 1 = 2.