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Calculate the mass of the product that is formed when 127.56 g of calcium reacts with 149.52 g of nitrogen. Use a balanced equation and both mass-mass equations.
A sample of water contains: suspended matter = 100 mg; Ca(NO3)2 = 16.4 mg/L; MgSO4 = 24 mg/L; MgCl2 = 19 mg/L; NaOH = 40 mg/L and KOH = 56 mg/L. Calculate temporary, permanent and total hardness of the water sample in PPM. (Atomic masses of Na = 23; Mg = 24; K = 39 and Ca = 40).
Determine all the symmetry operations for the following compounds
i) Triphenylphosphine
ii) complex - bipyramid
iii)Benzene derivative
iv)ICl2Br2
How many moles are there in 3.65 x 1025 molecules of water?
A piece of limestone was added to 1.0dm³ of 0.1mol/dm³ Hydrochloric acid. After the effervescence had stopped, 31.25cm³ of the resulting solution required 250cm3 of 0.05mol/dm³ sodium hydroxide for complete neutralization. Calculate the mass of lime stone
(r.a.m: H=1.0, O=16.0, C=12.0, Na=23.0, Cl=35.5, Ca=40.0)
Write the equation of the corresponding states and explain the meaning of the terms involved in it.
A sample of water on analysis has been found to contain the following in ppm Ca(HCO3)2 = 10.5; Mg(HCO3)2 = 12.5; CaSO4=7.5; MgSO4 = 2.6; CaCl2 = 8.2; Calculate temporary, permanent and total hardness of the water sample in degree Clark and degree French. (Atomic masses Mg = 24; and Ca = 40).
20 ml of standard hard water (containing 15gms of CaCO3 per 500 mL) required 25 mL of EDTA Solution for titration. 100 ml of water sample required 18 mL EDTA Solution, while same water after boiling required 12 mL EDTA solution. Calculate carbonate and non-carbonate hardness of water in PPM.
A sample of water contains: suspended matter = 100 mg; Ca(NO3)2 = 16.4 mg/L; MgSO4 = 24 mg/L; MgCl2 = 19 mg/L; NaOH = 40 mg/L and KOH = 56 mg/L. Calculate temporary, permanent and total hardness of the water sample in PPM.
A sample of CO2 gas at 25 ºC has a volume of 15 L and exerts a pressuer of 15.6 psi. How many grams of gas are in the sample?
