Answer:
A Type IV PFD is an approved device designed to be thrown to a person in the water. It is not designed to be worn. It is designed to have at least 16.5 pounds of buoyancy. The most com- mon Type IV PFD is a buoyant cushion.
A. LITTORAL ZONE is a freshwater ecosystem that is home to rooted plants.
Littoral zone is the shallow area of a lake, pond, river or ocean. This is the area where mangroves grow.
Some counties and water district identify littoral zones so that these zone will be planted with native plants. This is done for the purpose of having the plants purify the water and maintain a balanced ecosystems.
Two Pairs
The two oxygen atoms share two pairs of electrons, so two covalent bonds hold the oxygen molecule together.
The chemical equation would be written as:
<span>C7H6O3 + C4H6O3 –> C9H8O4 +C2H4O2
</span>
First, we need to determine the limiting reactant by converting them into moles. After, we use the amount of limiting of reactant to determine the theoretical yield.
<span>89g of salicylic acid ( 1 mol / 138.13 g ) = 0.644 mol
</span><span>21 ml of acetic anhydride ( 1.02 g / mL) ( 1 mol / 102.09 g ) = 0.2098 mol
Therefore, the limiting reactant would be the acetic anhydride as it is th consumed completely.
</span>0.2098 mol acetic anhydride ( 1 mol C9H8O4 / 1 mol acetic anhydride) ( 180.157 g / 1 mol ) = 37.80 g C9H8O4
Percent yield = 11.3 / 37.80 x 100 = 29.89%
