What part of it are you confused about
As the question tells you, you need to use the formula
% mass= mass of solute/ mass of solution x 100
mass solute= 30.0 g
mass of solution= 30.0 + 270.0= 300.0 g
% mass= 30.0/ 300.0 x 100= 10%
answer is B
Answer:
Option D is Correct answer
Answer:
Light travels in a straight line until it strikes an object.
As white light passes through a prism , it bends and separates into different colors
Answer:
2.64 ×
J
Explanation:
I think you should mark it a physics question instead but anyway.
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The Planck equation should be applied:
E = hv , while E is energy of proton; h is Planck constant; and v is frequency.
E = 6.6 ×
× 4 × 
= 6.6 × 4 × 
= 2.64 ×
J