Chemistry

When a student doesn't polish a sample of Mg ribbon before massing it, what happens when calculating the molar volume? Is it that the Mg ribbon doesn't completely react therefore less volumes of gas are produced?

  1. 👍 0
  2. 👎 0
  3. 👁 157
asked by K
  1. "Old" magnesium has a thin coating of MgO on the surface. The purpose of polishing is to remove the oxide coating. If you don't remove the oxide coating then the mass of "real" Mg is too high (due to the oxide coating being weighed along with the Mg) and less gas is evolved than should be.

    1. 👍 0
    2. 👎 0
  2. Thanks :) so just to be clear, does it matter what the Mg is reacting with, or is it always going to have the coating of the MgO on it?

    1. 👍 0
    2. 👎 0
    posted by K
  3. In air the coating will be MgO. In some other atmosphere it may be something else.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. maths

    I am sewing a skirt and i need a total of 390cm of different coloured ribbon. The white ribbon needs to be 40cm longer than the red ribbon while the blue ribbon needs to be 3 times as long as the red ribbon. the purple ribbon is

    asked by jess on April 26, 2017
  2. Algebra

    A candy cane 30 cm high has a circumference of 3 cm. The red “ribbon” makes exactly 4 complete turns round the candy cane while its two ends touch the cane's top and bottom. How long is the ribbon in cm? It doesn't make any

    asked by Alexandra on February 1, 2011
  3. math

    There is a blue ribbon, a yellow ribbon, and a green ribbon. susan did now wear the yellow ribbon or the green ribbon. Jean did not wear the gren ribbon. Clare wore either the blue ribbon or the green ribbon. what color ribbon did

    asked by mythreyee on September 19, 2012
  4. math

    Mary bought a roll of ribbon.After using 5/8 of the ribbon to decorate some packages,she had 15ft of the ribbon left.How many feet of ribbon did she buy?

    asked by lidia on November 8, 2011
  5. math

    Jaya had three ribbon with her. The length of the green ribbon was 12 metres 50 cm. The red ribbon was 3/4 of the lengh of the green ribbon. The yellow ribbon was 5/2 times the red ribbon.what is the length of the yellow ribbon?

    asked by Tehzeeb on January 5, 2017
  6. English

    posted by rfvv yesterday at 8:51pm 1. He doesn't see any students in front of the school. 2. He doesn't see any student in front of the school. [Are both okay? Which one is common?] Writeacher yesterday at 11:00pm Both are fine.

    asked by rfvv on April 30, 2018
  7. Math

    Five girls share nine feet of ribbon equally how many feet of ribbon does each student recieve?

    asked by RD on February 28, 2017
  8. math

    Three friends each have some ribbon. Carol has 42 inches of ribbon, Tino has 2.5 feet of ribbon, and Baxter has 1.5 yards of ribbon. Express the total legth of ribbon the three friends havein inches, feet and yars. **We are

    asked by kymy on December 12, 2014
  9. pre algebra

    robin is making bows to sell at her mothers yard sale she will use 3/4 foot of a ribbon and 2/3 of blue ribbon what is the ratio of the length of the blue ribbon to the red ribbon

    asked by elizabteh on September 30, 2015
  10. Math

    Ginny had 1 4/5 yards of green ribbon and 1 2/3 yards of yellow ribbon. Did she have enough ribbon to put around a hat that needed 3 yard of ribbon? Explain your answer. ----------------------------------- I need help on the

    asked by Bonny the Horse on April 10, 2016

More Similar Questions