chemist is trying to prepare a solution of molarity 1.60 M by diluting a 2.13 M solution. This is a dilution equation and dilution formula needs to be used
c1v1 = c2v2
where c1 is concentration and v1 is volume of the more concentrated solution
c2 is concentration and v2 is volume of the diluted solution to be prepared
substituting the values in the equation
2.13 M x 1.24 L = 1.60 M x v2
v2 = 1.65 L
the volume of the diluted solution is 1.65 L
B. 0.72 mol NaCl
http://www.convertunits.com/from/grams+NaCl/to/moles
Answer:
163 L
Explanation:
To find the volume, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = constant (0.0821 L*atm/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation, you first need to convert Celsius to Kelvin.
P = 3.50 atm R = 0.0821 L*atm/mol*K
V = ? L T = 75.3 °C + 273.15 = 348.45 K
n = 20.0 moles
PV = nRT
(3.50 atm)V = (20.0 moles)(0.0821 L*atm/mol*K)(348.45 K)
(3.50 atm)V = 572.1549
V = 163 L
There are 30 protons and 39 neutrons in the nucleus.
This must me the isotope of an element with an atomic mass close to 69 u.
The only candidates are Zn and Ga.
Zn has a zinc-69 isotope with mass 68.926 u.
Ga has a gallium -69 isotope with mass 68.925 u.
The isotope is probably
.
It has 30 protons and 39 neutrons.