Determine the mass in grams of pentane that must be added to 67 g of benzene to make a 1.04 m solution. give your answer to 2 decimal places.

5.02 g pentane.

Explanation:

Hello,

Molality is given by:

Since the mass of the solvent (benzene) is 67 g, its value in kg is 0.067 kg because it is needed in that way in the formula. Now, solving for the moles of pentane (solute):

Converting from moles to grams of pentane, we get the final

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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.