Answer:
221.37 u
Explanation:
The formula for the calculation of the average atomic mass is:
Given that:
For first isotope:
% = 65.51 %
Mass = 223.95 u
For second isotope:
Since the element has only 2 isotopes, so the percentage of second is 100 - first percentage.
% = 100 % - 65.51 % = 34.49 %
Let, Mass = x u
Given, Average Mass = 223.06 u
Thus,
Solving for x, we get that:
x = 221.37 u
<u>Thus mass of second isotope = 221.37 u</u>
Answer:
C ) Cu(s) + 2AgNO3(aq)
Explanation:
A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.
For example:
Cu(s) + 2AgNO3(aq) → 2Ag + Cu(NO3)2
In this reaction Cu and AgNO3 are reactants while Ag and Cu(NO3)2 are products.The number of atoms are same on both side however arrangement of atoms is different.
Answer:
In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Once evaporated, a molecule of water vapor spends about ten days in the air.
The value of of is 1.7× .
So, option C is correct one.
Calculation,
Number of moles of = mass/molar mass = 0.45/278.1 = 1.618× moles
Concentration of and ion
Molarity of = Number of moles of solute /volume in lit
Molarity of = 1.618× moles /0.1 lit = 0.0162 M
→ + 2
For certain amount of , twice this amount of ion formed.
The concentration of ion formed = 2× 0.0162 M = 0.0324 M
Now,
of = [ ] = 0.0162 × = 1.7× .
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Density
=mass÷volume
=19.67÷5.90
=3.33 g/ml