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Water supply in a city is fluoridated by adding NaF. The preferred concentration of F- is 1.6ppm.calculate the amount of Naf in milligrams should be added per gallon (treated water) if the water supply is 0.2 ppm in F-?
What masses of iron(III)oxide and aluminium must be used to produce 15.0g iron? What is the maximum mass of aluminium oxide that could be produced?
Find the volume of oxygen - What volume of oxygen is needed to completely combust 2.07 L of methane gas
By Solving this problem student understand about isotopic abundance and how to calculate atomic weight (average atomic mass) of an element -
Element symbols and Chemical formulas - What is the total number of atoms found in each of the following compounds? What is the total number of elements found in each?
A mixture of CO2 and N2 gases has an experiment density of 21922 mol/m3 at T=225K and Pressure= 68.759 MPa and Z=1.67661. What is density of this mixture of gases in mol/m3 by Peng-Robinson equation of state? (Mole fraction of Co2= 10.56%)
Find what is the initial concentration of the chlorine before dilution - unknown concentrated chlorine
Determine theoretical yield, limiting agent and excess reagent - How much excess reagent remains after the reaction goes to completion
Find molarity, molality, percentage composition, boiling and freezing point of a solution - What are the boiling and freezing points of the solution?
Find the change in the fraction of visibility for a person from planet Krypton with x-ray vision in addition to visible spectrum.
Evaluate the electronic configuration for ionization energies of Magnesium, the orbital number in which the electrons are added in phosphorus ion, and the one will lose in the ionization of Alluminium.
Find out the Celsius temperature of 2.49 mol of gas contained in a 1.00 L vessel at 1.8 atm pressure.
Calculate How many mL of the HCl solution was required for the titration.
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