Other Chemistry Answers

A mixture of gases with a total of pressure of 100 ATM is 75% N2 and 25% O2 what is the gas pressure of N2 gas in this mixture

How many titanium are in a pure titanium bicycle frame with a mass of 1.28kg

What mass of oxygen (931.998 g/mol) would be needed to react with exactly 0.0154 mol of aluminum (26.982 g/mol)?

For the following analytical scenario below which involved initially diluting 20 ml of the original water sample into a 1000 ml volumetric flask. Subsequently, the sample was prepared and analyzed as depicted below:


Volemetric flask (500ml) #1
Sample Composition: 5 ml of sample + 0 mL of 300 ppm Na 0.5% LiCl2
Absorbance: 0.12


Volemetric flask (500ml) #2
Sample Composition: 5 ml of sample + 1 ml of 300 ppm Na + 0.5% LiCl2
Absorbance: 0.17


Volemetric flask (500ml) #3
Sample Composition: 5 ml sample + 2 ml of 300 ppm Na + 0.5% LiCl2
Absorbance: 0.21


I. If all the flasks were diluted to a final volume of 500 ml with distilled water calculate the final concentration of sodium in the sample through a graphical and mathematical solution.

II. Why Lanthanum and Cesium or Lithium are added to solutions to be analysed for Calcium and Sodium respectively?

9) In a study of the poisoning of fish, 0.500 g of samples of fish tissue were analysed for barium. Each sample was digested with a permanganate-sulfuric acid mixture, and the volume adjusted to 10 mL and to construct calibration curve, 0.500-g samples of uncontaminated fish tissue were injected with various amounts of Ba+2, and corresponding absorbance as follows:

Standard 0: 0.00μg Ba+2; 0.015
Standard 1: 50 μg Ba+2; 0.220
Standard 2: 100 μg Ba+2; 0.415
Standard 3: 150 μg Ba+2; 0.602


If all samples and standards were treated in identical manner, what was the concentration of barium (in μg Ba per g of fish) in a fish sample whose absorbance value was 0.421 and 0.378, respectively?

How many grams of water are formed from 20 grams of C5H12 by using this equation C5H12+8O and 5CO2+6H2O

How many grams of oxygen react with 72.0 grams of C5H12 by using this equation-C5H12+8O2 and 5CO2+6H2O?

A chemist requires 0.423 mol Na2CO3 for a reaction. How many grams does this correspond to?

The test tube should be held vertically with the opening pointing straight up to avoid spills when heating contents. true or false?

Methanol (CH3OH) is produced commercially by the catalyzed reaction of carbon monoxide and hydrogen:
CO(g)+2H2(g)←−→CH3OH(g).
An equilibrium mixture in a 2.00 −L vessel is found to contain 4.33×10−2 mol CH3OH, 0.180 mol CO, and 0.303 mol H2 at 500 K.
Calculate Kc at this temperature.