Chemistry Answers

How many mL of 0.250 M barium nitrate are required to precipitate as barium sulfate all the sulfate ions from 50 mL of 0.350 M aluminum sulfate?

3 Ba(NO3)2 (aq) + Al2(SO4)3 (aq) --> 3 BaSO4 (s) + 2 Al(NO3)3 (aq)

Hydrogen peroxide (H2O2) is a powerful oxidizing agent used in concentrated solution in rocket fuels and in diluted solutions is hair bleach. An Aqueous solution of 25% (m/m) has a density of 1.05 g/ml. Calculate the concentration in terms of:

a. Mole Fraction of H2O2

b. Molarity

An ethanol solution is prepared by dissolving 15 mL of ethanol (C2H5OH) (density: 0.850 g/ml) in a sufficient volume of water to produce 120 mL of solution with a density of 0.980 g/mL. What is the concentration of ethanol in this solution expressed as:

a. Volume percent

b. Mass percent

c. Mass/volume percent

d. Mole fraction of Ethanol

e. Molarity

f. Molality

what is the osmosis epheromen, Explain the importance of osmosis 

Calculate the molarity and molality of an NH3 solution made up of 35.0 g of NH3 in 75.0 g of water. The density of the solution is 0.982 g/mL

Calculate the selectivity towards the main product B in the following first order kinetics reactions at 100°C and at 20°C.

A → B, k₀ = 10⁹, E_A = 60 kJ

A → C, k₀ = 10¹², E_A = 80 kJ

A given mass of a gas occupies 150cm cube at 20 degrees Celsius and pressure at 1.013*(10*5) Newton per meter. Calculate the temperature at which the volume is doubled at the same pressure?

A reaction produces ∆H = -231 kJ/mol of heat. What is the adiabatic temperature rise of the reaction mixture if the specific heat of the reaction mixture is C_P = 1.9 kJ/(kg·K) and the reactor contains m = 200 kg of the reaction mixture? The density of the reaction mixture is d = 800 kg/m³ and the final concentration of the product is supposed to be C = 2 mol/dm³.

How can you use a flame test to distinguish between hard and soft water

Balance this equation by algebraic method Al+o2=Al3o2