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Chemical formulas point to the ratios of the different types of atoms in a compound. Percentage composition indicates the relative masses of each element in a compound. Mass ratios are important for lab work, while atomic ratios are important for understanding chemical reactions.
A certain ionic compound is made entirely of aluminum and oxygen.
A) Explain what is the formula for this compound?
Express your answer using chemical symbols and subscripted numbers.
B) Find out the composition percentage by mass of each element in the compound.
Type the percentage of Al followed by the percentage of O separated by a comma. For instance type 20, 80 if the compound is 20 percent aluminum as well as 80 percent oxygen. Don't enter a percent sign.
When liquid water at 0°C and 1 atm is converted to ice at 0°C and 1 atm, 6.01 kJ mol-1 of energy is released as heat to the surroundings. Calculate the change of entropy for the water, ΔSwater
Each carbon-oxygen bond is somewhere between a single and a double bond. 3.Each oxygen atom has a double bond 50% of the time 4. The actual structure of formate is an average of the two resonance forms
Nitromethane has a relatively high boiling point of around 100 c. Which of the following intermolecular force is not present in pure liquid nitromethane and why.
Consider the titration of 50.0 mL of 0.20 M NH 3 (K b =1.8×10 ?5 ) with 0.20 M HNO 3 . Calculate the pH after addition of 50.0 mL of the titrant.
What is the activation energy for a reaction if its rate constant is found to triple when the temperature is raised
The surface area of an object to be gold plated is 49.7cm2 and the density of gold is 19.3g/cm3. A current of 3.25A is applied to a solution that contains gold in the +3 oxidation state. Calculate the time required to deposit an even layer of gold..
design a qualitative analysis scheme that will be used to calculate which cations are present in a solution containing
With regard to chromatography analysis, explane why peak area is usually preferred to peak height and how an internal standard is used and why it is useful.
FeCl3 reacts with only one of the two compounds: aspirin and salicylic acid. With which part of a molecule does FeCl3 react
Which attactive force(s) must be overcome in order to boil liquid ammonia, NH3. dispersion forces. ion-ion forces. hydrogen bonds. ion-dipole forces. covalent bonds
Concentrated HCl was added to a Ca(OH)2 suspension (in water) and the precipitate dissolved. Explain this observation on the basis of a Le Chatelier's shift in the equilibrium.
if the height of the mercury column in the leveling bulb is 20 mm greater than that in the gas buret and the atmospheric pressure is 650 mm, what is the pressure of the gas trapped in the buret?
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