General Chemistry Answers

A backyard swimming pool holds a volume of 190 cubic yards (yd³) of water. How many of the following dimensions are equivalent to 190 yd³ ? Assume the density of water is 1.00 g/mL

We have 11.2 l O₂ available, how many grams of oxygen correspond to this volume under standard conditions? Ar(O) = 16

Determine the molarity of a solution in mol/L that is prepared by completely dissolving 1.23 g of solid SrF2 (Mm=125.616g/m) in 417g of water.

A student timed an experiment as taking 12.5 seconds. The student knew that her reaction time was 0.20 seconds. What is the percentage error in the timing?

a. 0.012 %

b. 0.023 %

c. 1.2 %

d. 2.3 %

You are given a freshly prepared ferrous solution whose Fe2+ concentration is yet to be determined by redox titrimetry. The following chemicals and glasswares are available for you to determine the Fe2+ concentration: Ferrous sulphate solution (unknown), FeSO4(aq) Potassium permanganate solution, KMnO4= 0.02 moldm-3 di-potassium oxalate monohydrate, K2C2O4 .H2O solids Analytical balance Hot plate with magnetic stirring facility Burette (50.00 mL) Pipette (25.00 mL) 3M H2SO4 solution Titration flask How would you determine Fe2+ concentration in ferrous sulphate solution as accurately and precisely as possible. {Hint: Identify the Primary standards, Secondary standards, Precision of the instrument and glasswares.}

How many atoms of sulfur are present in 2.40 moles of sulfur trioxide SO3

An 29 g sample of an isotope of Strontium-90 was formed in 1960 explosion of an atomic bomb at

Johnson Island in the Pacific test Site. In what year will only 0.625 grams of the Strontium-90 remain?

Half-life of Strontium-90 is 28.8 years

Sulfur dioxide is an important industrial chemical.

Sulfur dioxide dissolves in water to produce sulfurous acid.

SO₂(g) + H₂O(l) → H₂SO₃(aq)

Explain the change in the pH of the solution as sulfur dioxide dissolves

 A sample of nitrogen gas expands in volume from 1.6 L to 5.4 L at constant temperature. Calculate the work done in joules if the gas expands (a) against a vacuum, (b) against a constant pressure of 0.80 atm, and (c) against a constant pressure of 3.7 atm.

What mass of Lithium Oxide is formed when 1.0g of Lithium is burned in 1.3g of Oxygen