An instrument which measure relative humidity is a hygrometer
Answer:
You determine the weighted averages if the individual isotopic masses.
Procedure:
The atomic mass of Si is the <em>weighted average </em>of the atomic masses of its isotopes.
We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).
The three stable isotopes of Si are Si-28 (27.98 u, 92.22 %), Si-29 (28.98 u, 4.69 %), and Si-30 (29.97 u, 3.09 %).
Set up a table for easy calculation.
0.9222 × 27.89 u = <em>x</em> u
0.0469 × 28.98 u = <em>y</em> u
0.0309 × 29.97 u = <em>z</em> u
TOTAL = (<em>x</em>+<em>y</em>+<em>z</em>) u = atomic mass of Si.
Solution:
The molecular equation is:
Now, the oxide ion reacts with water to produce hydroxide ions,
The ionic equation is:
The 
ions are present on both the sides, so the net ionic equation becomes,
Now, to determine acid and base, we will look at the definitions
Acid: It is defined as proton donor that is it donates 
ions.
Base: It is defined as proton acceptor that is it accepts ions.
In the ionic equation, water is donating ions to 
therefore it acts as an acid and oxide ion acts as a base.
According to newtons law every action has a equal reaction therefore it will push back 200n aswell
Answer:
The enthalpy of vaporization of H2O is higher than the enthalpy of fusion of H2O, therefore vaporizing the same mass of H2O would require more heat/energy than melting the same mass of H2O.
hope it helps!
