General Chemistry Answers

How many grams of lithium are in 0.356 moles of lithium phosphide? 

If you have 0.880 g of magnesium, how many grams of magnesium phosphate can you make?

A popular tent for packing purpose weight 3 pounds, 11 ounces. What is this mass in grams and in pictograms

Calculations show that a reaction should yield 5.67 g of carbon dioxide gas, CO2 what volume should be expected at 26 C and 782 mmHg

___Fe + ___Na​3​PO​4​ → ___ Fe​3​ (PO​4​ )​2​ + ___ Na

• Express 36.24 mm as dm and as um

A piece of copper at 95.3 °C is placed in a calorimeter containing 34.5 grams of water at 22.7 °C. If the temperature at equilibrium is 28.9°C, what is the mass of the copper? The specific heat of copper is 0.385 J/(gC).

the rate ot the reaction X + 2Y = Z is equal to eight times the rate constant when [X] = 2M and [Y] = 2M. Deduce TWO possible expressions for the equation. If the nital concentration of each reactant is 2M, deduce in tems of the rate constance K a possible value for the rate of the reaction when the concentration of Z, reaches 0.2M.

A sample of aqueous solution containing fluoride anion with a volume of ohm / 100 was measured by potentiometric method using fluoride ion selective electrode. The potential of the electrode (relative to the reference) in this solution is 0.1v. If 10 mL of standard 100ppm fluoride solution is added to this solution, the potential changes to 0.4 v. Measures. What is the concentration of fluoride (F) in the initial solution in terms of ppm? (The slope of the trance equation is done in buffer solution with pH = 6.0.)

In the determination of the amount of calcium by gravimetric method by precipitating it to form CH, 0, if the weighted form after heating the precipitate is CaCO3, if there is 2.0% CaCO (due to incomplete decomposition) in the solid residue What is the percentage of relative error in determining calcium?