Chemistry Answers

The N in a 0.4984-g sample of organic material is converted to NH4HSO4 by digestion with concentrated H2SO4. If the NH4+ ions are precipitated as (NH4)2PtCl6 and the precipitate is ignited to Pt, what is the percentage of N in the sample if the Pt weighs 0.1876 g?

An impure magnetite (Fe3O4) sample weighs 0.5023 g. This is converted to Fe2O3 by chemical reactions. The Fe2O3 obtained weighs 0.3995 g. What is the percentage of Fe3O4 in the magnetite?

Provide the possible candidate ion/s for the primary adsorbed layer of a colloid formed when small amounts of silver nitrate is added to a solution of potassium chromate by accounting the following five factors: solubility, concentration, common ion, ion charge and ion size. Write the colloid formula.

how many moles of gas would you have if you had a volume of 50.0 L at a pressure of 1.01 atm?

does the shape and polarity of a molecule affect how it interacts with the environment?

How Many types of reactions occur in liquid ammonia ?discuss any two in detail.

Aqueous solutions of potassium iodide and silver nitrate are mixed, forming the

precipitate silver iodide.

1. Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of aluminum are needed to produce 20.0 mol of hydrogen?

2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g)

0.034 kg of potassium iodide in the preparation of a 23.5% potassium iodide solution. Calculate the grams of the water that must added

12g of water is saturated by 15g of potassium chloride at 20c calculate the solubility of potassium chloride at 20c [k=39,cl=35.5]