Chemisty

Ok this is what i got for the grams part now....
Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18
%H2O = (20.14/98.18)*100 = 20.51%
%C2O4 = (51.64/98.18)*100 = 52.60%
% Fe 3+ = (11.34/98.15) * 100= 11.55%
% K + = (15.06/98.15) * 100 = 15.43 %
20.51 g H2O, 52.60 g C2O4 11.55 g Fe 3+, 15.43 g K+

you said redo the mols and percent... can you give me an example of how please

  1. 👍 0
  2. 👎 0
  3. 👁 93
asked by LT
  1. Take a 100 g sample; therefore, we will have the following:
    20.51 g H2O.
    52.60 g C2O4.
    11.55 g Fe^+3.Note: you typed 98.15 but apparently divided by 98.18).
    15.43 g K^+. Note: you typed 98.15, it should be 98.15--which gives the same number--BUT, I think you transposed the numbers. It should be 15.34. The reason I spotted this is that the percentages didn't add to 100%. I ALWAYS check to make sure they do before I go to the next part of the problem.

    Convert these to mols.
    mols H2O = 20.51/molar mass = 20.51/18.015 = ??
    Find mols of the other entities, then find the ratio of the mols of each to each other. The easy way to do this is to divide the smallest number by itself, then divide all the other numbers by the same small number, to keep the equality. If the answers are close to whole numbers, round them to whole numbers and uou have the formula of the compound. I think you will get some numbers close to 1/2 and if so you can't throw those away by rounding. In that case, just multiply everything through by 2 to get the whole number.

    1. 👍 0
    2. 👎 0
    posted by DrBob22

Respond to this Question

First Name

Your Response

Similar Questions

  1. CALCULUS

    The masses of 10 books are found to be in an arithmetic sequence. If their total mass is 13 kg and the lightest book has a mass of 400 grams, what is the mass of the heaviest book? 2,000 grams 2,100 grams 2,200 grams 2,300 grams

    asked by Chelsy on November 27, 2012
  2. math

    two pieces of bread has a mass of 25 grams total and meat and cheese have a mass of 85 grams total what is the mass of the sandwich in all?

    asked by connie on April 2, 2019
  3. Chemistry

    The overall cell reaction occurring in an alkaline battery is: Zn(s) + MnO2(s) + H2O(l) ---> ZnO(s) + Mn(OH)2(s) a) How many moles of electrons flow per mole of reaction?...answer: 2. Mol e-Note: b) If 6.09g of zinc is oxidized,

    asked by Dalton on November 21, 2015
  4. chemistry

    You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 650 grams. The total mass of the set-up is 850 grams. The chemical is ignited by means

    asked by maath on September 12, 2018
  5. chemistry

    You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 800 grams. The total mass of the set-up is 1000 grams. The chemical is ignited by means

    asked by Kris on August 1, 2013
  6. Chemistry

    You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 850 grams. The total mass of the setup is 1050 grams. The chemical is ignited by means

    asked by Staci on January 23, 2012
  7. math

    Eric has a two rocks samples. One has a mass of 600 grams and the other has a mass of 1 kilogram. He recorded the total mass as 7 kilogrmaas. Explain what he did wrong? What should be the correct answer in grams?

    asked by Math on March 25, 2014
  8. chemistry

    Mr. Arswan iss preparing a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan`s mixture? A 30.5 grams B 179 grams C

    asked by na on October 6, 2013
  9. Chemistry

    Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 0.155gx46.0 = moles moles x 6.02 E23 = answer Part 1 Answer:

    asked by Summer on June 14, 2011
  10. MATHS

    A pie is cut into two equal parts. The first part of the pie is shared between Abdul and Kate. Kate has 3 times as much as Abdul. The second part of the pie is shared between Sarah and Ron. Ron has 3/5 as much as Sarah. The mass

    asked by LARA on November 7, 2013
  11. chemistry

    Find the molar masses of the following compounds: 1. LiI 2. PbCO4 3. Mg(OH)2 4. (NH4)3PO4 Find the percent composition (percent by mass) of the given element in the following compounds: 1. Fluorine in AgF 2. Hydrogen in glucose

    asked by Alex on March 2, 2015

More Similar Questions