Chemistry

I'm going crazy please help me out

part 1 of 2 Determine the mass of anhydrous copper(II) sulfate that must be used to prepare 250 mL of 2.01 M CuSO4(aq). Which i found to be 80.204g

part 2 of 2
Determine the mass of CuSO4.5H2O that must be used to prepare 250 mL of 2.01 M CuSO4(aq).

another question
Na3AsO4 is a salt of a weak base that can accept more than one proton. If 30.2 g of Na3AsO4 is dissolved in water to make 250 mL of solution, how many moles of sodium cations are in the solution?
Answer in moles

  1. 👍 0
  2. 👎 0
  3. 👁 520
  1. 1. 80.204 is ok except you are not allowed that many significant figures.

    2. This one is done just like #1 but instead of molar mass being 159.61 it is 159.61+(5*80)= ?? or about that. YOu need to check that out.

    3. moles Na3AsO4 = grams/molar mass.
    moles Na^+ = 3x that. The amount of water in which it is places makes no difference.

    1. 👍 0
    2. 👎 0
  2. of 1.79 M CuSO4(aq).

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry 11

    A 5.0 g sample of Cu(NO3)2-nH20 is heated, and 3.9 g of the anhydrous salt remains. What is the value of n? I got as far as finding the molar mass of Cu(NO3)2, which is 187.5g/mol Please help me further with this question.

    asked by Rona on November 1, 2016
  2. Chemistry

    12.3g of iron(ii)tetraoxosulphate(vi)crystals when heated gave 6g of the anhydrous salts.if only its water of crystalisation is lost as a result of the heating,calculate the % by mass of the water of crystalization.

    asked by TEEMAH on June 26, 2020
  3. chemistry

    FORMULA OF A HYDRATE Some salts, when crystallized from water solutions, retain definite proportions of water as an integral part of the crystal structure. This type of crystal is called a hydrate. In this experiment, you will

    asked by dat dude on November 27, 2018
  4. Chemistry

    A 2.914 gram sample of gypsum, a hydrated salt of calcium sulfat, CaSO4, is heated at a temperature greater than 170 degrees Celcius in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 2.304

    asked by Sara on September 24, 2012
  5. Physics

    At t = 0, a 785 g mass at rest on the end of a horizontal spring (k = 125 N/m) is struck by a hammer, which gives the mass an initial speed of 2.70 m/s. (a) Determine the period of the motion. T= .4979201367s Determine the

    asked by Anon on December 7, 2010
  1. Chemistry

    A 2.914-g sample of gypsum, a hydrated salt of calcium sulphate, CaSO4, is heated at a temperature greater than 170 °C in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 2.304 g. Calculate the

    asked by Destiny on February 19, 2019
  2. chemistry

    A 0.940g sample of barium chloride dehydrate is heated and 0.800g of anhydrous residue remains after cooling. A. How many moles of anhydrous barium chloride were present in the sample? B. How many moles of water were present in

    asked by Aima on November 4, 2016
  3. science

    I did a hydrate lab in school and these were my results and at the end we have to write the correc formula for the hydrate but I know the answer at the end is supposed to be 5H2O so why do I keep getting 4H2O? Can someone double

    asked by cara on April 1, 2009
  4. chemistry

    mass of crucible- 18.50g mass of crucible+hydrate- 19.50g mass of crucible+anhydrous salt 1st heating- 19.10g mass of crucible+anhydrous salt 2nd heating- 19.10g Questions: 1. calculate mass of water lost from your sample 2.

    asked by Amanda on May 29, 2012
  5. Chemistry

    A student is given 2.94g of a mixture containing anhydrous MgCl2 and KNO3. To determine the percentage by mass of MgCl2 in the mixture, the student uses excess AgNO3 to precipitate the chlorides ios as AgCl Starting with the 2.94g

    asked by Shariah on January 23, 2017
  6. Science

    What is the molar mass of anhydrous salt in CuSo4 5H2O

    asked by Jeanie on December 10, 2007

You can view more similar questions or ask a new question.