Suppose you dissolve 52.2 g of na2co3·xh2o in enough water to make 5.00 l of solution. the final concentration of the solution was found to be 0.0366 m. determine the integer x in the hydrate: na2co3·xh2o. round your answer to the nearest integer.

x = 10.

Explanation:

M = (no. of moles of Na₂CO₃·xH₂O) / (Volume of the solution (L)).

∴ no. of moles of Na₂CO₃·xH₂O = (M of Na₂CO₃·xH₂O)*(Volume of the solution (L)) = (0.0366 M)*(5.0 L) = 0.183 mol.

∵ no. of moles = mass/molar mass

∴ Molar mass of Na₂CO₃·xH₂O = (mass of Na₂CO₃·xH₂O)/(no. of moles of Na₂CO₃·xH₂O) = (52.2 g)/(0.183 mol) = 285.245 g/mol.

∵ The molar mass of Na₂CO₃·xH₂O = Molar mass of Na₂CO₃ + x (molar mass of water).

The molar mass of Na₂CO₃·xH₂O = 285.245 g/mol.

Molar mass of Na₂CO₃ = 105.9888 g/mol.

molar mass of water = 18.0 g/mol.

∴ 285.245 g/mol = 105.9888 g/mol + x (18.0 g/mol).

x (18.0 g/mol) = 285.245 g/mol - 105.9888 g/mol = 179.257 g/mol.

∴ x = (179.257 g/mol)/(18.0 g/mol) = 9.958 ≅ 10.

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.

c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.