A mixture of coarse sand and sugar is 45.0 percent sand by mass. 120.0 grams (g) of the mixture is placed in a fine-mesh cloth bag and dunked repeatedly in Lake Michigan. After drying, the mass of the contents of the bag equals: . A. 66.0 g
B. 120.0 g
C. 65.0 g
D. 72.00 g
E. 54.0 g

Option E

Explanation:

From the question we are told that:

Amount of sand in percentage

Sample size

Note:After being dumped in the river repeatedly the sugar melts away leaving behind the insoluble sand

Generally the equation for Amount of sand content is mathematically given by

 

 

 

Therefore

After drying, the mass of the contents of the bag equals

 

Option E

Answer is: Fluorine is the most reactive because it has 7 electrons in the outer shell.
Number of electrons in outer shell determines atom reactivity, not number of protons and neutrons.
Electron configuration of fluorine: ₉F 1s² 2s² 2p⁵.
Electron configuration of neon: ₁₀N 1s² 2s² 2p⁶.
Fluorine tends to have eight electrons in outer shell like neon (noble gas) and gains one electron in chemical reaction.