General Chemistry Answers

which of the following gases at STP would have the greatest volume

Calculate the enthalpy change for the following chemical reaction:

CS2 (l) + 3O2 (g) —> CO2 (g) + 2SO2 (g)

1) C (s) + O2 (g) —> CO2 (g)

ΔH°= -393.5 kJ

2) S (s) + O2 (g) —> SO2 (g)

ΔH°= -296.8 kJ

3) C (s) + 2S (s) —> CS2 (l)

ΔH°= +87.9 kJ

Calculate the standard enthalpy change, ΔH, for the following reaction:

2CH3OH(l) + 3O3(g) —> 2CO2(g) + 2H2O(g)

Given:

CH3OH (l) ΔHf° = -238.7 kJ

CO2 (g) ΔHf° = -393.5 kJ

H2O (l) ΔHf° = -285.8 kJ

Arrange the following compounds (H2O,H2S,BR2,NaCl) in increasing...Boiling Points:
Melting Points:
Surface Tension:
Vapor Pressure:
Viscosity​

A nonionizing solid dissolved in water changed the freezing point to -2.79°C. Calculate its concentration.

What percentage of magnesium is found in magnesium oxide?

(0.33g Mg used and 0.53g of MgO formed)

An unknown element D has two stable isotopes, ¹⁸⁵D and ¹⁸⁷D with masses of 184.9523 amu and 186.9564 amu. The average atomic mass of element D is 186.2071 amu. 

Determine the percentage abundances of the two isotopes.

A 40.0 g sample of ethanol releases 2952 J as it cools from 50.0 °C. Calculate the final temperature of the ethanol.

If it takes 640 J of heat energy to increase the temperature of 100 g of a substance by 25˚C (without changing its phase), calculate the specific heat of the substance.

An object doing work at 541 J while losing 134 J of heat, calculate the value of E.