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Why must all the lines in the hydrogen spectrum between 2500 A and 7000 A belong to the Balmer series?
The freezing point of benzene is 5.5oC. What is the freezing point depression of a solution of 5.00 g naphthalene (C10H8) in 444 g benzene (Kf of benzene = 4.90oC/m)?
In the concentration range of 500 to 2000 ppm of U, there is a linear relationship between absorbance at 351.5 nm and concentration. At lower concentrations the relationship is nonlinear unless about 2000 ppm of an alkali metal salt is introduced ..
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.210 M HClO(aq) with 0.210 M KOH(aq). The ionization constant for HClO (4.0*10-8).
The specific heat capacity of solid copper metal is 0.385 J/g-K. How many joules of heat are needed to raise the temperature of a 1.55-kg block of copper from 33.0C to 77.5C?
A certain amount of glucose, C6H12O6 burned in oxygen, and produced 22 grams of carbon dioxide, CO2. How many grams of water was produced at the same time?
explain the earodynamics characteristics of margarine firmness and coefficient of friction important in agricultural engineering research and development.
Will a precipitate of magnesium fluoride form when 300. mL of 1.1 × 10^-3 M MgCl2 are added to 500. mL of 1.2 × 10^-3 M NaF? [Ksp (MgF2) = 6.9 × 10^-9]
Calculate the work in Joules when 2.5 mols of water vaporizes at 1 atmosphere pressure and 25 degrees C. The work is done in pushing back the atmosphere.
What is the molarity of a solution that contains 41.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol}) in 280 mL of solution?
Calcium fluoride, CaF2, is a source of fluorine and is used to fluoridate drinking water. Calculate its molar mass to four significant figures.
The substance X is an element which has the elemental form of X(s) at 25oC. The standard enthalpy of formation of HXO4(g) is -818.0 kJ/mol at 25oC. The standard entropy of HXO4 (g) and X(s) are, respectively 175.8 J/mol•K and 30.70 J/(mol•K) at 25..
3.953g of egg shell was reacteed with 50ml of 0.1 mol/l hcl and shel contains ca2co3 after all the sheell reacted resultign solution was placed in a columetric flask and th colume made up to be 100ml.
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