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Explain what is the molarity of an HCl solution whose density is 1.13g/cm3 as well as that contains 25.7% HCL wt/wt?
a1.15 g sample of dry ice is added to a 765 ml flask containing nitrogen gas at a temperature of 25.0 c and a pressure
cake alum aluminum sulfate is commonly used to purify sewage. what mass of precipitate aluminum hydroxide forms when
The density of lead is 11.4 g/cm3 at 25°C. Calculate the volume occupied by 25.0 g of lead.
What compound could be added to a 0.10 M KC2H3O2 solution to make it an effective buffer. Also, write a balanced chemical reaction for the addition
either through the formation of a single molecule or by bonding to another atom of similar electronic geometry and results in an arrangement of orbitals that is possible within the valence shell of an atom
1. A chemist wanted to amke 3-hydroxy-pentanal via an aldol condensation a. What two aldehydes could be used to make this product. b.What 3 other products could form. 2. Write a mechanism for the aldol reaction between acetaldehyde and benzaldehyde
A certain weak base has a Kb of 7.40 × 10-7. What concentration of this base will produce a pH of 10.11
An aqueous solution is 5.50 % by mass ammonia, NH3, and has a density of 0.975 g/mL. What is the mole fraction of ammonia in the solution?
The discovery of hafnium, element number 72, provided a controversial episode in chemistry. G. Urbain, a French chemist, claimed in 1911 to have isolated an element number 72 from a sample of rare earth (elements 58-71) compounds. However, Niels B..
(i) Arrange the following compounds in the order of increasing melting points: (a) He, (b) NH3, (c) LiBr, (d) Ar, (e) CsBr, (f) PH3, (g) CsI, and (h) RbBr.
Explain why corresponding phosphorus and arsenic compounds resemble each other more closely than they do nitrogen compounds
The ball is used on the driveway at temperature of -7 degree C and feels flat. What is the actual pressure of the air in the ball ? What is the gauge pressure?
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