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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.
A solution is prepared by dissolving 35.0 g of hemoglobin (Hb) in enough water to make up 1 L in volume. If the osmotic pressure of the solution is found to be 10.0 mmHg at 25 oC, calculate the molar mass of hemoglobin
how many moles of oxygen are consumed each time 0.500 mole of P2O5 is formed?
State whether each of the following properties of the main group elements generally increases or decreases a) From left to right across a period b) From top to bottom within a group- metallic character, atomic size, ionization energy, acidity of oxid..
Which of the following compounds would you expect to be ionic?
Why is it important to make sure all of your unknown has vaporized? Why is it important to put a pinhole in the aluminum "cap"?
what is the total mass in grams of a series of samples that have masses of 753mg,
What mass of precipitate forms when 185.5 mL of 0.533 M NaOH is added to 627 mL of a solution that contains 15.8 g of aluminum sulfate per liter
what is the percent relative error? Please explain by showing work. Are these measurements more precise or more accurate? What is the purpose of repetition in measurements?
A pH of 3.74 is reached when 18.50 mL of sodium hydroxide has been added to the acid solution. What is the molar mass of formic acid given this data?
It takes 42 min for the concentration of a reactant in a first order reaction to drop from 0.45 M to 0.32 M at 25 degrees C. Explain how long will it take for the reaction to be 90% complete
in the manufacturing of computer chips cylinders of silicon arecut into thin wafers that are 3.00 inches in diameter
If a solution of hydroxylamine/ hydroxylammonium buffer contains 0.117 M NH2OH, Compute the morality of HONH3Cl required if the solution is to have a pH of 4.76.
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