use the periodic table to identify an element is by looking for the element's name or elemental symbol.
Answer: The empirical formula for the given compound is
Explanation : Given,
Percentage of C = 84.4 %
Percentage of H = 15.6 %
Let the mass of compound be 100 g. So, percentages given are taken as mass.
Mass of C = 84.4 g
Mass of H = 15.6 g
To formulate the empirical formula, we need to follow some steps:
Step 1: Converting the given masses into moles.
Moles of Carbon =
Moles of Hydrogen =
Step 2: Calculating the mole ratio of the given elements.
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 7.03 moles.
For Carbon =
For Hydrogen =
Step 3: Taking the mole ratio as their subscripts.
The ratio of C : H = 1 : 2
Hence, the empirical formula for the given compound is
15.63 moles of HgO are needed to produce 250. 0 grams of Oxygen.
<h3>How we calculate moles from masses?</h3>
Moles of any substance can be calculated as:
n =W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2HgO → 2Hg + O₂
From the stoichiometry of the reaction, it is clear that:
2 mole of HgO = produce 1 mole of O₂
Given mass of O₂ = 250 grams
Molar mass of O₂ = 32 g/mole
Mole of produced O₂ = 250g / 32g/mole = 7.81 moles
Now, 7.81 moles of O₂ = produced by 2×7.81 = 15.63 moles of HgO
Hence, option (3) is correct i.e. 15.63 moles is the required moles.
To know more about moles, visit the below link:
brainly.com/question/16060223
Answer:
Sodium dodecyl sulfate (SDS) unfold the protein into simplier pieces and makes protein negatively charged.
Explanation:
Two-dimensional (2D) electrophoresis is gel electrophoresis used for protein separation from protein mixture. Similar to other electrophoresis, this 2D electrophoresis uses different pH gradient which is applied on the gel so one end of the gel will be more positive than the other. It uses two dimensions for protein separation. In first dimension proteins are separated according to their isoelectric point (no need for protein to be charged here to be separated). Second dimension separates protein according to their mass. But first of all, protein needs to be unfolded, converted to simplier pieces. For this purposes, the substance called sodium dodecyl sulfate (SDS) is used. Once unfolded, proteins are binding to SDS which is negatively charged, so the proteins become negatively charged as well. This negativity allows proteins to be separated by second dimension. These will follow more positive charge within the gel. A protein binds a number of SDS molecules proportional to the protein's length. Since a protein's length is proportional to its mass, this is equivalent to saying that it attaches a number of SDS molecules roughly proportional to the protein's mass.
Matter exists in different states such as solid, liquid and gas because of the kinetic energy of its particles and the intermolecular force of attraction between the particles.
A substance won't condense into a liquid or solid if the average kinetic energy is higher than the attraction forces holding the particles together.
Thus in solids, intermolecular force of attraction > kinetic energy of particles.
In a liquid (or solid), the average kinetic energy of the particles is low enough to allow the forces of attraction to hold the particles together. In a liquid (or solid), molecules do not separate.
In liquids, intermolecular force of attraction > kinetic energy of particles. But this force of attraction is smaller than solids.
The forces of attraction between the particles in a gas can be overcome by the average kinetic energy of the particles in the gas. When gas molecules collide, they spread apart.
In gas, intermolecular force of attraction < kinetic energy of particles.
To know more about states of matter visit the link:
brainly.com/question/9402776?referrer=searchResults
#SPJ1