Assume a mixture of radon and helium is separated by diffusion. What % by weight of the gases would be helium?
To do any mass percent question one must first understand a little about fractions. If one has a fruit basket, with 3 apples, 2 oranges, 4 bananas, and a grapefruit, we could say that there is %30 apples in the basket, %20 oranges and so on if we were talking about the percentage by fruit. If we were talking about percenta
What is the mass percent of a solution prepared by dissolving 18.9 grams of solid into 39.5 grams of water?
How many moles of water are made from the reaction of 2.2 moles of oxygen gas with unlimited quantities of hydrogen gas? Given the reaction:2H2 + O2 > 2H2O
35.0 mL of gasoline in 200.0 mL of kerosene has what volume percentage?
How many grams of HCl does 250.00 mL of 6.500M HCl contain?
What is the molarity of a solution formed from 20.0 grams of NaCl dissolved in 650.0 mL of H2O?
Finding the weight of a substance (in grams) contained in a given molarity of solution. Concentrations of solutions.
How many grams per milliliter of NaCl are contained in a 0.250 - M solution?
A solution is prepared by dissolving 1.26 g AgNO3 in a 250- ml volumetric flask and diluting to volume. Calculate the molarity of the silver nitrate solution. How many millimoles of AgNO3 were dissolved?
Calculate the number of grams in one mole of CaSO4.7H2O Formula for finding the number of moles in a substance
What is the empirical formula of a compound containing 83% potassium and 17.0% oxygen?
What would the emperical formula be for the molecular compound C6H9O4?
How many grams of CO2 would be formed from 20 grams of C6H6 in the reaction of 12CO2?
1. Nickel(11) chloride reacts with sodium phosphate to produce nickel(11) phosphate and sodium chloride. NiCl2(aq) + Na3PO4(aq) -----> Ni3(PO4)2 (s) + NaCl(aq) a. Balance the equation above b. Using the balanced equation, find out how many moles of nickel(11) chloride are required to produce 0.479 mol of nickel
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Electrochemistry can be used to measure electric current in a silver coulometer. The cathode is weighed before and after the passage of the current. A silver cathode initially has a mass of 10.77 grams and its mass increases to 12.89 grams after current has flowed for 15.0 minutes. Compute the quantity of charge in coulombs a
When phosphorus is burnt in a free supply of air, diphosphorous pentoxide is formed. During later stages of combustion in a limited supply of air, the flame becomes larger greenish and flickering. Another phosphorus oxide is formed which is a white waxy crystalline solid which melts @ 23.8 degrees C and becomes a gas @ 176 degre
A Cr3+ solution is electrolyzed using a current of 1.50 A. What mass of Cr is plated out after 24 hours, and what amperage is required to plate out 2.85 grams of Cr from a Cr3+ solution in a period of 2.50 hour?
Air bags are activated when a severe impact causes a steel ball to compress a spring & electrically ignite a detonator cap. This causes sodium azide(NaN3) to decompose explosively: 2NaN3(s) = 2Na(s) + 3N2(g) What mass of NaN3(s) must be reacted to inflate an airbag to 70.0 L. at STP?
Find the number of moles in 922 grams of iron (III) oxide.
7) Which would be used up first? How many grams of Cl2 will be produced? TiO2 + HCl = TiCl2 + Cl2 + H2O if 0.86 mole of TiO2 and 1.5 lbs of HCl react
Balance the following equation: UF5 + H2O = UO2F2 + UF4 + HF a) What is the maximum amount of UF4 that can be made from the 10.5 gms of UF5 and 5.0 gms of H2O b) How much of which reactant is left after the reaction stops?
9) Industrially, nitric acid (HNO3) is produced by the Oswald process represented by the following - what mass of NH3 is needed to produce 5 tones of HNO3? How much Oxygen is required? 4NH3 + 5O2 = 4NO = 6H20 2NO + O2 = 2NO2 2NO2 + H2O = HNO3 + HNO2
4) Calculate the concentration 0.208 g of AlCl3 (strong electrolyte) in 250mL of solution
(Any number following an asterisk is a subscript.) Using the balanced chemical equation: C*6H*12O*6 + 2H(positive charge)--> C*6H*14O*6 answer the following A. How many grams of C*6H*12O*6 equals one mole? B. How many grams of C*6H*14O*6 equals one mole? C. How many moles of H(positive charge) react with 1 mol of C*6H*12O*
(any number following an asterisk is a subscript) Using the equation for the combustion of methane: CH*4(L) + O*2(G) --> CO*2(G) + H*2O(G) answer the following: A. Is the equation properly balanced and if not balance it. B. Name the compounds in this reaction. c. How many moles of O*2 react with 1 mol of CH*4? D. How many
If 350.0 mL of 6.00 M H2SO4 reacts with 45.00 grams of Al in the following reaction, what is the limiting reagent, how many moles of excess reagent will there be, and how many liters of H2 will form? The reaction is: H2SO4 + Al produces Al2(SO4)3 + H2 If you could please show the steps, I'd appreciate it.
If 275.0 mL of 0.5000 M ZnCl2 reacts with 1.650 x 10 to 23rd power of AlPO4 compounds in the following reaction, what is the limiting reagent, how many moles of excess reagent will there be, and how many grams of each product will form? 3 ZnCl2 + 2 AlPO4 yields Zn3(PO4)2 + 2 AlCl3 I am substitute teaching, and I would lik
If 45.7 grams of Na reacts with excess H2O, how many grams of each product will form? (You need to determine the equation of the reaction in order to determine the answer.) I am working as a substitute teacher and need to teach this material to my class - please explain the steps needed to solve this question (at the high sc
How do you rank these? (Please see the attachment.)