Explore BrainMass

Explore BrainMass

    Stoichiometry

    BrainMass Solutions Available for Instant Download

    Nickel Chloride and Sodium Phosphate Reaction

    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

    Osmotic pressure problem

    Brackish water with a salt content around .5 percent by mass is found in semiarid regions such as the American Southwest. Assuming that brackish water has the same density as pure water and contains only sodium chloride, estimate the osmotic pressure of brackish water at 298K. A hint is that the the total molarity is the sum

    Chemistry Equations: Ozone Production

    1. The following reaction is used in laboratories to produce oxygen: At 25 degrees Celsius and one atmosphere pressure, how many liters of O2 gas will be produced from the reaction of 75.0g of KClO3? 2. If the volume fraction of ozone in the air of a city is 6x10-7, what is the ppm of ozone in the air?

    Antiprotons annihilate with protons

    Compute the energy released in joules per event and in kilojoules per mole when antiprotons (the antimatter corresponding to protons) annihilate with protons. An antiproton has the same mass as a proton. Equation: 1 H + 1 H > energy

    Electrochemistry: Mass and Charge Equations

    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 and

    Empirical & Molecular Formula

    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

    Nuclear reactions: mass and time equations

    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

    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?

    Balancing and Limiting

    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?

    Show work-Oswald process - mass and how much oxygen required?

    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

    Chemical equation with 7 parts

    (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*

    A equation with 9 parts

    (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

    Solubility product constant

    A saturated solution of silver chloride, AgCl contains 1.92 mg of AgCl per liter of solution. What is the value of the solubility product constant Ksp for silver chloride? I know that soluability for AgCl at 25 degrees celcius ksp = 1.8 x 10 -10, however I am not sure if I would even need to incorporate this into the equatio

    This deals with limiting reactants in stoichiometry

    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.

    Stoichiometry problem dealing with limiting reagents

    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

    Limiting reactants in stoichiometric

    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

    Molecule Density Ranks

    How do you rank these? (Please see the attachment.) How do you rank these by density? What is the order of density for these compounds?

    Calculating Molarity and Molality

    Question: A sodium chloride solution has a molarity of 1.250 mol/L and a density of 1.050 g/ml. Calculate molality, the mole fraction of water, and the percent by mass of sodium chloride.

    Solve: Distance, Velocity, Density and Volume

    Questions: 1. If the sun which is 93,000,000 miles away away from Earth was to go out, how long would it take for us to know that this had happened? Light travels at a speed of 3 x 10^8 meters/second. 2. What would the density be (in g/cm^3) of a block that is 4 cm by 15 cm by 12 cm, and has a mass of 4.3 kg? 3. An ob

    Mass Balance Problem

    Please see the attached file for full problem description. --- Q1. Starting with a pulp with a water content of 99%, how much water must be removed to obtain one ton of paper containing 60% water? Solution. Water removed Pulp

    Calculating the Mass of Compounds

    Please view the attached file to see the various compounds I need to calculate the mass of. I am having some difficulty approaching these questions.