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Fluorite, a mineral of calcium, is a compound of the metal with fluorine. Analysis shows that a 2.26 g sample of fluorite contains 1.50 g calcium. Calculate the following.
(a) mass of fluorine in the sample
(b) mass fraction of calcium and fluorine in fluorite calcium fluorine
(c) mass percent of calcium and fluorine in fluorite calcium fluorine
the average european woman consumes food with energy content of 7525kj. what is the daily intake in kilocalories or food calories
Ammonium ferric sulfate dodecahydrate (NH4Fe(SO4)2 • 12 H2O) is synthesized via the two step process shown below. In the first step an acidic solution of iron (II) ions are oxidized to iron (III) ions with nitric acid.
 What is the pH of the acidic solution before titration? 4.  What is the pH of the reaction mixture after 10.0 mL of NaOH was added?
P4(s) + 6F2(g) --> 4PF3(g) How many grams of fluorine are needed to react with 6.20g of phosphorus?
The CO2 output of an astronaut is about 1.3 kg/day. What is the minimum mass of LiOH required for a six-day space shuttle flight involving five astronauts?
100 ml sample of hard water is titrated with the ETDA solution in problem 2. the volume of EDTA required to reach the end point is 22.44 ml
Calculate q when 28.6 g of water is heated from 22.0?C to 78.3?C. (the specific heat capacity for water = 4.184 J/(g•oC).
Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cd and Ag+ in the balanced reaction. Cd(s) + Ag+(aq) ? Ag(s) + Cd2+(aq)
in a .1000 M NaOH solution, 20.76 mL of the NaOH solution were required t neturalize completely 13.15 mL of the malonic acid solution; what is the molarity of the malonic solution?
All of the following are physical properties of a substance in a liquid state EXCEPT a.indefinite volume b.definite mass c.not easily compressed d.indefinite shape
A sample of water at 23.0 C required an input of 1.69 x 10^4 J of heat to reach its boiling point, 100 C. What is the MASS of the water
when a current of 0.156A is passed through a solution of lead(II) nitrate, lead is deposited at the cathode. How long will it take to deposit 0.10g of lead?
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