Answer:
Mass of solution = 2 g
Explanation:
Given data:
Mass of CuSO₄ = 0.20 g
Percent by mass = 10%
Mass of solution needed = ?
Solution:
Formula:
Percent by mass = mass of solute / mass of solution × 100
Now we will put the values.
10 = 0.20 g/ mass of solution × 100
10/ 100 = 0.20 g/ mass of solution
0.1 = 0.20 g/ mass of solution
Mass of solution = 0.20 g/ 0.1
Mass of solution = 2 g
Answer:
0.02 m
Explanation:
∆U = q + w
w = ∆U - q = (1380 - 2040) J = -660 J
w = -p∆V = -pA∆h
∆h = -w/(pA)
p = 1 bar × (100000 Pa/1 bar) = 100000 Pa
∆h = -(-660 J)/(100000 Pa×0.33 m²) = 0.02 m
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Here are some trends you should know.
Electronegativity increases as you go right and up along the periodic table.
So, (1) is wrong
Atomic mass increases as you go right and down along the periodic table.
So, (2) is wrong
Proton number or atomic number increases as you go right and down in the table.
So, (3) is correct
Metallic character increases as you go left and down along the periodic table.
So, (4) is wrong
