17) 8.4 / 20 x 100
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
Iodine 131 is a radioisotope with a very short half-life of 8.02 days, making it highly radioactive. Frequently used in small doses in thyroid cancers therapies, it is also one of the most feared fission products when accidentally released into the environment. Radiotoxicity of iodine 131.
Answer:
B) translucent
Explanation:
Light only partially passes through them.
Opportunity cost
Opportunity cost is the benefit, profit or value that could have been received or obtained but instead given up in favor of another alternative or course of action. Every situation has several alternatives and every resource has several alternative uses as well. Thus, every decision comes with it an opportunity cost. <span>
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The molarity of the solution is 0.260 M
<u><em>calculation</em></u>
step 1: calculate the moles of NaOH
moles = mass÷ molar mas
= 5.20 g÷ 40.00 g/mol= 0.13 moles
Step 2: find the molarity of solution
molarity = moles÷volume in liters
=0.13 moles÷ 0.500 L = 0.260 M
