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Black Forest Biologicals, a biotech startup, has a promising Alzheimer's drug candidate Compound SLT-88 entering Phase I trials this year. SLT-88 is the only product formed by the reaction of two precursor compounds A and B, both of which are quite expensive. The chief medicinal chemist of Black Forest is trying out different reaction conditions to minimize the cost of manufacturing SLT-88.

In the table below are listed the initial and final amounts of A and B used under two different trial conditions, and also the actual amount of SLT-88 recovered in each case. Complete the table by calculating the theoretical yield of SLT-88 and the percent yield of SLT-88. Round your amounts to the nearest milligram and your percentages to the nearest whole percent.

Trial amount of A amount of B yield of SLT-88 initial final initial final theoretical actual % 1 350.mg 0mg 950.mg 589.mg   626.mg % 2 300.mg 0mg 700.mg 518.mg   241.mg %

 

Phosphoric acid, a mild acid used among other things as a rust inhibitor, food additive, and etching agent for cavity repair by dentists, can be made from elemental phosphorus in a two step process. In the first step, phosphorus and oxygen react to form diphosphorus pentoxide:

P4(s)+5O2(g)→2P2O5(g)   In the second step, diphosphorus pentoxide and water react to form phosphoric acid (H3PO4):   P2O5(g)+3H2O(l)->2H3PO4(l)   Suppose the yield of the first step is 65.% and the yield of the second step is 88.%. Calculate the mass of phosphorus required to make 1.0kg of phosphoric acid.

Dinitrogen pentoxide gas (N2O5) is obtained by the reaction of nitrogen trioxide gas (NO3) and nitrogen dioxide gas (NO2).

Write a balanced chemical equation for this reaction.

The following chemical reaction takes place in aqueous solution:

2AgNO3(aq)+Na2CO3(aq)→Ag2CO3(s)+2NaNO3(aq)

Gaseous methane (CH4) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). What is the theoretical yield of carbon dioxide formed from the reaction of 0.32g of methane and 1.9g of oxygen gas? 

Round your answer to 2 significant figures.

Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.

Na(s)+O2(g)--->Na2O2(s)

A chemist determined by measurements that 0.060 moles of tin participated in a chemical reaction. Calculate the mass of tin that participated in the chemical reaction. 

Round your answer to 2 significant digits.