General Chemistry Answers

Determine the following for a 0.250 mole sample of CO2 gas.

a. Volume, in liters, at 27°C and 1.50 atm

b. Pressure, in atmospheres, at 35°C in a 2.00 L container

c. Temperature, in degrees Celsius, at 1.20 atm pressure in a 3.00 L container.

d. Volume, in milliliters, at 125°C and 0.500 atm pressure

A sample of carbon dioxide (CO2) gas has a volume of 15.2 L at a pressure of 1.35 atm and a

temperature of 33°C. Determine the following for this gas sample.

a. Volume, in liters, at T= 35°C and P= 3.50 atm

b. Pressure, in atmospheres, T= 42°C and V= 10.0 L

c. Temperature, in degrees Celsius, at P= 7.00 atm and V= 0.973 L

d. Volume, in milliliters, at T= 97°C and P= 6.70 atm

A sample of dry air, with a volume of 125 ml and a temperature of 53°C, is heated at constant pressure to 95°C. What is the new volume in milliliters of the sample?

How many oxygen are in (a) 0.25 mol NaOH, (b) 1.50 mol Na² So⁴,and (c) 2.25 mol KNO³

1. Find the molality and molarity of the sample consisting 75% Copper and 25% Nickel by mass. The computed density of this sample is 0.00639 g/mm3.

a Amylum, commonly known as starch is a white powder with variable molecular formula due to the different number of repeating sugar units based on the plant that it is obtained from_ sample of amylum in the form of spherical beads was subjected t0 series of analyses to determine physicochemical properties in the quality control unit of a factory. From the results each bead is found to have a 4.5 mL volume and 1.47 glmL density_ 4 of the beads were placed in a reaction chamber combusted as a result; 43.1 g CO2 and 14.7 g HzO were obtained. If the molecular weight of the amylum is 972.84 glmol how many repeating units the starch molecule consist and what is the molecular formula of the starch? [Empirical Formula-CxHyOz' Repeating unit-n; Molecular Formula=( CxHyOz)"*n= CnxHnyOnz]

Case #2: Sodium chloride eye drops

Your pharmaceutical analysis company has been contacted by an important client and asked to analyze a batch of eye drops containing a NaCl solution. The description of your brief states that you are supposed to analyze the API in these tablets following standard quality assurance guidelines.

Typical analysis methods used for quality purposes are based on titration reactions. A certain volume of NaCl solution is titrated with silver nitrate (AgNO3). Potassium chromate is used as the appropriate indicator.

(a) Research the type of titration described.

1. Tungsten carbide (WC), used in making tools and jewelries, is produced by the reaction of tungsten hexachloride (WCl6), H2 and CH4 at 670℃.

WCl6 + H2 + CH4 WC + 6HCl

If 23.5 g WCl6 reacts with excess H2 and CH4, and 10.8 g WC are recovered, what is the percent yield?

1. Thermite reaction is necessary to produce molten iron. This reaction involves Fe3O4 and Al and is

described by:

8 Al + 3 Fe3O4 9 Fe + 4 Al2O3

If 198.5 g Al and 365.5 g Fe3O4 are used, what mass of the excess reagent remains unused at the

end of the reaction?

How much heat (in kJ) is released when 15.0 L of CO at 85°C and 112 kPa reacts with 18.5 L of H2 at 75°C and 744 torr?