Search & Filtering
The safety air bags in automobiles are inflated by nitrogen gas generated by the rapid decomposition of sodium azide, NaN3 (molar mass= 65.01 g/mol). If an air bag has a volume of 36 L and is to be filled with nitrogen gas at a pressure of 1.15 atm at a temperature of 26.0 °C, how many grams of NaN3 must be decomposed? _____ g NaN3
During a titration, 0.200 M HCl is added to a NaOH solution of unknown concentration. What is the concentration of the NaOH solution if 20.0mL of it is neutralized by 30.7mL of the standard solution? Show your work.
What is the molarity of a KOH solution if 25.0 mL of it is neutralized by 42.6 mL of a 0.100 M nitric acid solution? Show your work.
What is the pH of a 0.57 M solution of HCl, a strong acid? Show your work.
Write balanced chemical equations for each of the following reactions that involve acids and bases.
A. aluminum and hydrochloric acid
B. nitric acid and sodium chloride
C. potassium hydroxide and sulfuric acid
Determine which of the following species is the strongest oxidizing agent.
1. NO3-, Ag+, Cr2O72-
2. Ce4+, Br2, Zn
3. Mg2+, Na+, Li+
B. Determine which of the following species is the strongest reducing agent.
4. I-, Fe, Mn2+
5. F-, Zn, Au
A 2.144-g sample of phosgene, a compound used as a chemical welfare agent during World War 1, Contains 0.260g of carbon, 0.347g of oxygen, and 1.537g of chlorine. what is the empirical formula of this substance
What is the concentration of Br- in a solution prepared by mixing 0.500 L of 0.0450 M KBr and 0.250 L of 0.0250 M CaBr2?
In the year 2025, NASA was able to find another planet (XXV) which may be able to sustain
life. In order to determine if the planet’s water can sustain an earth organism’s life, Winkler
method was employed to determine dissolved oxygen content. A water sample from planet
XXV was obtained and then treated with the usual reagents for Winkler titration. A 50.0 mL
aliquot of this sample was titrated with the 0.010196M Na2S2O3 standard solution. It
required 4.16 mL of the titrant to reach the starch endpoint.
A. Calculate the amount of dissolved oxygen in the sample in terms of ppm O2. (FW O2 = 32.00)
How much faster does He atom effuse than N₂ molecule at the same temperature? (MMHe = 2g, MMN₂ = 28g)
