General Chemistry Answers

Determine the molar mass of a gas if 2.82 grams of the gas occupies

3.16 L at SATP( 25 deg C and 100 kPa) ? ( universal gas constant= 8.314 Kpa. L mol-1 K-1)

calculate CEC and show the calculation (for both soil A and soil B) used to derive CEC from the measured variables. You should also calculate the acid saturation, base saturation and the exchangeable sodium percentage (ESP)

soil samples for soil (A) 157.72 K(mg/kg) 756.56 Ca(mg/kg) 198.78 Mg(mg/kg

21.36 Na (mg/kg 0.06 Al+H (cmolc/kg)

soil( B)  142.66 K (mg/kg)  1139.54 Ca(mg/kg)  157.22 Mg(mg/kg  35.89  Na (mg/kg)

0.08 Al+H (cmolc/kg)

Balance the following reactions using the given method:

1. MnO4- + C2O42- = CO2 + MnO2 (half reaction in basic solutions)

1. Zn + NO3- = Zn(OH)42- + NH3 (oxidation method - basic solution)

Determine if the following chemical reactions are oxidation-reduction reactions or not. If the chemical reaction is NOT a redox reaction, write NONREDOX; otherwise, balance it by oxidation number method and determine the oxidizing and reducing agents. Show your solution following the step-by-step process of the said method

K₂​Cr₂​O₄ + H₂O₂ ​+ HCl → KCl + CrCl3₃ + O₂ + H2​O

. A student was given two metal cubes that looked similar. One was 1.05 cm on an edge and had a mass of 14.32 grams; the other was 2.66 cm on a side and had a mass of 215.3 grams. Determine whether these two cubes of metal are the same material using only the data given. 

Exactly 14.5  mL of water at 30.0 °C is added to a hot iron skillet. All of the water is converted to steam at 100.0°C. The mass of the skillet is 1.30  kg. What is the change in temperature of the skillet?

If 100 mL of a 5M solution is diluted to 1000 mL, what will be the molarity of the solution obtained?

lead-204 203.973amu, 1.40% abundance. lead-206 205.974 amu, 24.10% abundance. lead-207???, abundance 22.10%. lead-208 207.977, abundance 52.40%. Calculate the isotope mass of lead-207

3. You see a gold ring in a flea market that you'd like to have, and the price seems right, so you buy it. On the drive bome you wonder if it's really gold. You do a quick experiment and find it takes 38.7 J of heat to raise the temperature of the 6.00 g ring from 2SC to 75°C. You know that the specific heat ofgold is 0.128Jg"С, is your ring really made of gold?

When a solution prepared by dissolving 4.00 g of an unknown monoprotic acid in 1.00 L of water is titrated with 0.600 M , 37.0 mL of the solution is needed to neutralize the acid.

a

Determine the molarity of the acid solution.