Other Chemistry Answers

Starting with the expression of energy of an electron in the nth orbit of the hydrogen atom, derive the expression for Rydberg constant and calculate its value.

10 centimetre cubed of concontrated sulphuric(VI)acid was dilluted to 100 centimetre cubed. 20cemtimetre cubed of the resulting solution was neutralized by 36centimetre cubed of 0.1M sodium hydroxide solution.Determine the mass of sulphuric(VI)acid that was in 10centimetre cubed of concontrated solution and then determine the molarity of the concontrated sulphuric (VI)acid

the car antifreeze mixture is made by mixing equal volumes of ethylene glycol(d=1.114g/ml, molar mass=62.07g/mol) and water (d=1.000g/ml) at 20 degrees Celsius. the density of the solution is 1.070g/ml. find the mass percentage

The relative molecular mass of carbon dioxide, CO2, is 44. In an experiment the value of ? for CO2

was found to be 1.33. Assuming that CO2 is a perfect gas, calculate the specific gas constant, R,

and the specific heat capacities at constant volume and constant pressure, cv and cP.

2. What is the volume of a sample of laughing gas, N2O, that contains 7.11*1021 molecules of the compound?

3. If a balloon contains 2.14L of neon gas, what mass of neon gas is contained within the balloon?

4. If I hand you 6.92*1025 atoms of tungsten, what is the mass of the sample you receive?

For the following chemical reaction, what mass of phosphoric acid, H3PO4, in grams will be needed to produce 1.71 mol of water, H2O?

3KOH+H3PO4⟶K3PO4+3H2O

In an extremely explosive reaction between Glucose (C6H12O6) and Oxygen, 294.7g of water is produced when 500 grams of glucose is combusted. What is the percent yield of this reaction? (remember that the products of a combustion reaction are water and carbon dioxide)

a sample of CaCO3 of mass 2.8g was reacted with 75 cm3 of 1.0 mol/dm3 hydrochloride acid. The resulting solution was completely transferred into 250 cm3 of volumetric flask and the mixture made up to the mark with distilled water. 25 cm3 of this solution needed 20.05 cm3 of 1.0 mol/dm3 of NaOH to neutralize the excess acid. Calculate the percentage of CaCO3 present in the sample.

Find the weight percent of iron (55.85 g/mol) in a rock. Suppose that a 0.1773 g rock is crushed and dissolved in nitric acid. The solution is diluted to 100.00 mL. Then 15.00 mL of this solution is mixed with 10 mL 0.200 M chromophore. The resulting Fe complex has an absorption of 0.431 at 508 nm. A second solution is prepared exactly the same as above but spiked with 1 mL of 750 ppm Fe solution, which then gives an absorption of 0.808.

What is the value of q in J if (8.4900x10^1) grams of water (C = 4.18 J / g ºC) are heated from (2.97x10^1) ºC to (7.500x10^1) ºC?