General Chemistry Answers

Hydrogen gas was cooled from 423 K to 323 K. Its new volume is 75 mL. What was its original volume? Assume that pressure remains constant. *

In a biochemical assay, a chemist needs to add 2.93 g of glucose to a reaction mixture. Calculate the volume in mL of a 1.35M glucose solution she should use for the addition.

The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

1.    In an experiment to determine the rate of the reaction between persulfate ions and iodide ions in aqueous solution S₂O₈ ^–2  + 2I^– → 2SO₄ ^–2 + I₂ the following data were obtained:

(a)  (i) Deduce the order of reaction with respect to each of the reagents and hence write the rate equation for the reaction.

(ii) With reference to this reaction state what is meant by the overall order of a reaction.

(iii) Calculate the rate constant including units.

Calculate the energy required to heat 24g of ice at -20℃ to steam at 250℃. The

heat of fusion of ice is 334 J/g and the heat of vaporization of water is 40.7 kJ/mol. The

specific heat capacity of ice and steam are 2.03 J/g℃ and 2.01 J/g℃ respectively.

1. If the atomic radius of sodium atoms is 1.86 × 10⁻¹⁰ m, how many sodium atoms are needed to make a line that is 1.00 cm in length?

how to arrange these cations and anions on increasing order in the trend of ionic radii? Cl- , K+ , Na+ , Zn2+ , Mg2+

Al + Fe₃O₄ → Fe + Al₂O₃

Determine the masses of all the substances present after the reaction if  187 g of Al and  791 g of Fe₃O₄ react to completion. Some amounts may be zero (0).

A sample of platinum has a mass of 102g. When the sample is placed in a graduated cylinder containing 25.9mL of water, the water level rises to 30.3mL. What is the density of the platinum