Chemistry

A 32.907-g sample of a hydrate of Au (CN)3 contains 5.406 g H2O

What is the formula for the hydrate?
What is the percent water in this compound?
What mass of this hydrate contains 100.0 g H2O?

  1. 👍 0
  2. 👎 0
  3. 👁 340
asked by Cris
  1. mass Au(CN)3 + H2O = 32.907g
    mass H2O = 5.406g
    mass Au(CN)3 = 32.907-5.406 = ?g

    Convert ?g Au(CN)3 to mols = ?
    Convert 5.406g H2O to mols ?

    Find the ratio of mols H2O to 1 mol Au(CN)3 to find the formula.

    %H2O = (mass H2O/total mass)*100 = ?

    For part c, use the percent formula you just finished, substitute the numbers you want and solve for total mass.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A sample of a hydrate of CuSO4 with a mass of 250 grams was heated until all the water was removed. The sample was then weighed and found to have a mass of 160 grams. What is the formula for the hydrate? CuSO4 * 10 H2O CuSO4 * 7

    asked by cam on December 27, 2010
  2. chem

    a 2.50g sample of hydrate of calcium sulfate losses 0.523g of water when heated. what is the mass percent of water in the hydrate and the formula for the hydrate difference of the two masses divided by the initial mass. I believe

    asked by mocha81 on June 19, 2007
  3. Chemistry

    1.) A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the oxide? 3.) 2.000 grams of a sample containing Co, C2O4, and H2O showed there

    asked by Robert on March 3, 2013
  4. science

    (1) A sample of the hydrate CuSO4.5H2O has a mass of 12.5g. (a) how many molecules of hydrogen are contained in this hydrate? If the hydrate is completely dehydrated.

    asked by chancy xdicey on August 27, 2015
  5. chem

    A 3.48 gram sample of sodium sulfate hydrate lost 1.35 gram of water when heated to constant weight. What is the formula of the hydrate? this is what I did, but I am stuck. Na2SO4 . H2O------> NA2SO4+H20

    asked by Jenny on April 2, 2009
  1. Please help Chem

    A hydrate of barium chloride has the formula BaCl subscript 2 dot XH subscript 2 O.If a 1.055g sample of the hydrate contains 0.157g H2O, what is the "X" in the formula?

    asked by anony5 on September 19, 2013
  2. chemistry

    I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in

    asked by Nancy on November 8, 2012
  3. Chemistry

    Cobalt(II) chloride is commonly obtained from chemical supply houses as a hydrate with the formula CoCl2 • 6 H2O. An analysis showed that 25.0 g of this hydrate contains 11.3 g of water. What is the percent water by weight in

    asked by Destiny on February 19, 2019
  4. Chemistry

    I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in

    asked by Mary on February 18, 2013
  5. Chemistry grade 11

    Okay I've got a HUGE chem test tomorrow and I desperately need help! Please help!!!! 73. Hematite (Fe2O3) and magnetite (Fe3O4) are two ores used as sources of iron. Which ore provides the greatest percentage of iron per kilogram?

    asked by Lizzy B on April 26, 2017

More Similar Questions