Inorganic Chemistry Answers

why aluminuim is used in flashlight photography?

Dry air is a mixture, by volume, of 78% nitrogen (N2), 21% Oxygen (O2) and Argon (Ar 40 g).
a) Compute the gram molecular weight of dry air
b) Assuming water vapor saturation the new mixture being at 20 deg.Celius contains 2.4% water vapor by volume. Compute the new gram molecular weight of the mixture
c) In this last case compute the percentage of Oxygen, by weight, of the mixture

Question
Historically chlorine gaz, cl2 has been used do disinfect drinking and swimming pool waters. Knowing that chlorine gas reacts in water according to the following reaction:
CL2+H2O=HOCL+H+CL
and that the manufacturer of bleach water certifies that in 100 g of their product there are 10.8 g of NaCl (the other 89.2 g filling material with no relation at all with disinfection), that HOCl is a weak acid that dissociates as follows:
HOCl = H + OCl , pK= 7.54
Show that the 10.8 g of NaOCl is equivalent to 10.3 g of Cl2

Calculate the % yield from an experiment that produced 5.85 grams of Nitrogen gas from the combustion of 66.92 grams of CH3NH2 with 79.8 grams of O2 at 273°K and 1 ATM CH3NH2(g) + O2(g) → CO2 + N2 + H2O.

N2 and O2 are converted to monocations N2+ and O2+ respectively.which is wrong
1) in N2+,the N-N bond weakens
2) in O2+ the O-O bond order weakens
3) in O2+, the paramagnetism decreased
4) N2 become diamagnetic

A mixture, weighing 6.000 grams, contains 41.50 % Na3PO4 and 58.50 % BaCl2 of the mixture, by weight. When dissolved in water, a precipitate forms via the double displacement reaction:

BaCl2(aq) + Na3PO4(aq) NaCl(aq) + Ba3(PO4)2(s)

If the reaction is quantitative, the yield of the solid barium phosphate should be

A flow or 1.2 MGD is to be treated with 18 percent solution of hydrofluosilicic acid. the water to be treated contains no fluorid and the desired fluoride concentration is 1.4 mg/L. assume the hydrogluosilicic acid weighs 9.5 pounds per gallon and 79.2 percent fluoride purity of the acid. What is the hydrofluosilicic acid feed rate in gallons per day?

The common Eastern mole, a mammal, typically has a mass of 78 g, which corresponds to about 7.8 moles of atoms. (A mole of atoms is 6.02 × 10^23 atoms. In atomic mass units (u), what is the average mass of atoms in the common Eastern mole?

How many types of sulphides are formed when alkali metals react with sulphur?
2
3
4
5
4 The attractive force which binds a hydrogen atom of one molecule with an electronegative atom of another molecule of the same compound is called __________.
nuclear bond
electromagnetic force
hydrogen bond
covalent bond
5 Ionization energy _____________ down the group within the alkali metals.
increases
has no fixed pattern
remains const

All common cations are smaller than all common anions except for one of these.
Calcium cations
Magnesium cations
Sodium cations
Rubidium cations