Homework Help for Chemistry

The hydrogen atom can absorb light of wavelength 1094 nm. Determine the initial value of n associated with this absorption in the infrared region.     

Solve for the number of molecules of SiO2 with a mass of 40.9g

Explain the following

Diamond, graphite and fullerenes are crystalline forms of carbon

The inside of a sphere ordinarily contains air (approximately 80% N 2(g) and 20% O 2(g)). What will be the effect of the following changes (next four multiple choice questions) on the results of the experiment to determine absolute zero relative to the experiment as described in the lab procedures?

Air is replaced by He at atmospheric pressure (1.00 am)

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A 27.67 gram sample of iron is heated in the presence of excess chlorine. A metal chloride is formed with a mass of 62.79 g. Determine the empirical formula of the metal chloride.

A mixture is prepared that is 5.0% (w/w) of an unknown substance mixed with naphthalene (molar mass = 128.2 g mol^-1). The freezing
point of this mixture is found to be 77.3 °C. What is the molar mass of the unknown substance? (The melting point of naphthalene is 80.2 °C and Kf = 6.9 °C m^-1.)
The molar mass of the unknown substance =

Draw the structural formula of the product of the reaction shown below.

1. Ten grams of plastic beads with a density of 1.2g/cm^3 are added to 500mL of an organic solvent with a density of 0.80g/cm^3. What is the concentration of plastic beads in mg/L?

As we know that halogens are ring deactivater agents then how they are Ortho para directing???

4.00g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 60./gmol, is burned completely in excess oxygen, and the mass of the products carefully measured:

Use this information to find the molecular formula of X

A compound with a cubic structure, BaxTiyOz, is projected. below:

   (i) Find out the compound's stoichiometry. (ii) What are the Ti, O, and Ba ions' coordination numbers and geometries? (iii) Determine the kind of structure that this compound has chosen. (iv) Draw a projection using linked polyhedra to depict the "TiyOz" portion of the structure (i.e., identify the Ti-based polyhedra and demonstrate how these are linked together in the structure). (v) Make a suggestion for a preparation technique for this compound. One point (vi) What color does the compound have?