NEED HELP ASAP 20 POINTSThe concentration of a solution is equal to the mass of solute divided by the volu of solvent. Units of concentration are grams per 100 milliliters, g/100 mL. You add 12g of sugar to 100 mL of water. What is the concentration? Q.12 g/100ml 12 g/100ml

12g

120g​

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explanation:

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8