Questions from General Chemistry

Q: What happens to a gas sample when it is collected by displacement

What happens to a gas sample when it is collected by displacement of, or by bubbling through, water? How is this taken into account when calculating the pressure of the gas?

Q: The concentration of a solution may be expressed in various ways.

The concentration of a solution may be expressed in various ways. Suppose 5.00 g of NaCl were dissolved in 15.0 g of water, which resulted in 16.1 mL of solution after mixing. Explain how you would ca...

Q: a. If the pressure on a 125-mL sample of

a. If the pressure on a 125-mL sample of gas is increased from 755 mm Hg to 899 mm Hg at constant temperature, what will the volume of the sample become? b. If a sample of gas is compressed from an i...

Q: a. If the temperature of a 255-mL sample of

a. If the temperature of a 255-mL sample of gas is increased from 35 °C to 55 °C at constant pressure, what will be the new volume of the gas sample? b. If a 325-mL sample of gas at 25 °C is immersed...

Q: When calcium carbonate is heated strongly, it evolves carbon dioxide gas

When calcium carbonate is heated strongly, it evolves carbon dioxide gas. CaCO3(s) CaO(s) + CO2(g) If 1.25 g of CaCO3 is heated, what mass of CO2 would be produced? What volume would...

Q: If an electric current is passed through molten sodium chloride, elemental

If an electric current is passed through molten sodium chloride, elemental chlorine gas is generated as the sodium chloride is decomposed. 2NaCl(l) 2Na(s) + Cl2(g) What volume of chlorin...

Q: Calculate the indicated quantity for each solution. a. The

Calculate the indicated quantity for each solution. a. The percent by mass of solute when 2.05 g of NaCl is dissolved in 19.2 g of water. b. The mass of solute contained in 26.2 g of 10.5% CaCl2 sol...

Q: Calculate the indicated quantity for each solution. a. The

Calculate the indicated quantity for each solution. a. The mass of solute present in 235 mL of 0.251 M NaOH solution. b. The molarity of the solution when 0.293 mole of KNO3 is dissolved in water to...

Q: Calculate the molarities of the solutions resulting when the indicated dilutions are

Calculate the molarities of the solutions resulting when the indicated dilutions are made. Assume that the volumes are additive. a. 25 mL of water is added to 12.5 mL of 1.515 M NaOH solution. b. 75...

Q: What is a compound? What is meant by the law of

What is a compound? What is meant by the law of constant composition for compounds and why is this law so important to our study of chemistry?