General Chemistry Answers

Calculate the volume of a solution that contains 0.50 g of PCB, given a 0.15 ppm solution.

 Acids (H+) reacts with metal hydroxides (-OH-) to form

mass of atom A is 3.58*10-25 Kg. what is the relative atomic mass of A?

if 1.435 g of silver chloride has been formed what is the mass agno3 combined

10³ of hydrogen gas sparked with 20cm³ of oxygen, calculate the volumes of residual gasses after cooling

If ΔH is -29.3 J and the H_Products is 125.9 J, what is the H_Reactants? Show your work.

If H _Products is 12 J and H _Reactants is 34 J, what is the ΔH of the reaction? 

We place a metal rod weighing 5.00 g with a specific heat capacity of 0.490 J/K/g in 23.5 mL of water. The specific heat capacity of water is 4.184 J/K/g and we make the approximation that its density is exactly 1.000 g/mL. The water has an initial temperature of 20.0 °C and the metal rod has an initial temperature of 81.0 °C. What is the final temperature (in oC) of the water and metal rod?

The standard enthalpies of formation, at 25.00 °C, of methane (CH4(g)), water (H2O(I), and carbon dioxide (CO2(g)) are, respectively,-74.6 kJ/mol, -285.8 kJ/mol, and-393.5 kJ/mol. Calculate the amount of heat released (in kJ) during the combustion of 17.52 L of methane under a constant pressure of 1.000 atm at 25.00 °C (N.B. combustion is the reaction with molecular oxygen to produce water and carbon dioxide.) Q

the CO2 gas reaches the fire in 3.9 seconds, at what time will the CH4 reach the fire?

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