General Chemistry Answers

How many grams of dinitrogen tetroxide contain 2.85 grams of O

How many grams of N are present in 3.67 grams of dinitrogen tetroxide

A solution of sodium hydroxide has a concentration of 60 g dm^-3 . What is the molarity of the alkali?

[ Relative atomis mass : H=1, O=16, Na=23]

what mass of copper will be liberated during electrolysis by a charge of one faraday?

what are the factors affecting degree of ionization

What volume of air containing 21% of oxygen is required to completely burn 50g of sulfur containing 4% incombustible matter

The molecular orbital theory is used to deduce the magnetic properties of an atom, an iron or a molecule. According to this theory

A. Oxygen atom is para-magnetic

B. Oxygen molecule is diamagnetic

C.Nitrogen is both para and diamagnetic

D. CO₂ is para-diamagnetic gas.

If n A of current pass for 2 minutes at the cathode where a group I ion X⁺ dissociates 0.4moles of A reacts with dil H₂SO₄ and (n²/2)g of a salt (B) is produced. What quantity of charge was deposited at the cathode (RMM of B=2n)?

A. 2 √(0.2)C

B.2/5C

C. 0.6C

D. 3/8C

E. 9/ √(0.3)C

The energy level of hydrogen atom is given by the relationship E_n = -13.6/n² , where n is a whole number different from zero and E_n the energy in eV of level n. The wavelength of a seriesof level n whereby n is the number of decayed nuclei of a radioactive sample over a time period of 1 day with half-life of 12hours and initially number of nuclei 8.

A. 500nm

B. 416.1nm

C. 121.9 nm

D. 487.5nm

What is the mass of Al₂(SO₄)₃ needed to prepare 40 (p³)ml of (0.2p²)M of sulphate ions in aluminum sulphate solution? where p= log(moles of Al₂(SO₄)₃ ?