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The relative formula is like a career of someones jobs they do
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What is the percent composition of each element in magnesium permanganate?
To work this out you need the formula of the compound and your periodic table to tell you the relative atomic masses of each element. First add up all the relative atomic masses to get the relative formula mass. Then for each element in turn, take its relative atomic mass (multiplying up if there is more than one of it in the formula) and divide by the relative formula mass, then multiply by 100 to get a percentage. I'm not going to give you the answer - partly because then you'll never practise doing it for yourself, and partly because I wonder if you meant magnesium permanaganate, or the more usual school compound of potassium permanganate, KMnO4.
What are the masses of molecular oxygen O2 hydrogen H2 and nitrogen in grams?
The mass of O2 is approximately 32.00g/mol. The mass of H2 is about 2.016g/mol. These masses can be obtained by using the atomic weights of the atoms that make up these molecules.
Are warm air masses lighter than cold air masses?
Warm air masses are lighter than cold air masses because the molecules of cold air move slower than the warm air's molecules.
What is the prercent by mass of hydrogen in NH3?
The formula shows that there are three times as many atoms of hydrogen as of nitrogen in the compound. The gram atomic masses are 1.00794 for hydrogen and 14.0067 for nitrogen. Therefore, the percent by mass of hydrogen in the compound is 100{[3(1.00794)]/[3(1.00794) + 14.0067] or 17.7553 %, to the justified number of significant digits.
What mass of oxygen contain the same number of molecule as 42g of nitrogen?
Both nitrogen and oxygen exist at standard temperature and pressure as diatomic molecules. Therefore, the relative masses of equal numbers of molecules of the substance will the same as the ratios of their atomic masses, which are 15.9994 for oxygen and 14.0067 for nitrogen. The mass of oxygen that contains the same number of molecules as 42 g of nitrogen is 42(15.9994/14.0067) or 48 g, to the justified number of significant digits.
What is heavier Hydrogen gas or oxygen gas How do you know?
Oxygen is heavier as it has a mass number of 16 whereas hydrogen has a mass number of 1. Both form diatomic molecules (molecules of two atoms) making the formula masses 32 for oxygen and 2 for hydrogen.
Why one mole of hydrogen molecules and one mole of hydrogen atoms have different masses?
Because each hydrogen molecule contains 2 hydrogen atoms!
Why one mole of hydrogen molecules and one mole of H-atoms have different masses?
The hydrogen molecule is diatomic, H2.
How is the formula of hydrogen gas different from the formula for helium gas?
the answer is simple it is that both elements have different masses which makes each formula different
Is this statement true or false The isotope hydrogen-1 is the standard used for the relative scale of atomic masses?
true
How do you calculate Mr?
To calculate the relative molecular mass (Mr) of a molecule, add up the atomic masses of all the atoms in the molecule as shown in its molecular formula. For example, the Mr of H2O (water) is calculated by adding the atomic masses of 2 hydrogen atoms and 1 oxygen atom.
Who was The first attempt at publishing a list of relative atomic masses?
John Dalton tried to work out the relative masses of atoms; but his calculations were wrong, although the principle was correct. He was, however, the first to establish a table of atomic masses with hydrogen, the lightest atom, as the standard.
What is the Calculation of relative formula mass of Mg(OH)2.?
Add the atomic masses of each element present. It would be atomic mass of Mg + 2x atomic mass of oxygen + 2x atomic mass of hydrogen.
Why are gram formula masses called relative masses?
They are called relative masses because all of the masses of the elements are measured relative to the mass of an isotope of carbon called carbon-12. Carbon-12 has been assigned a mass of exactly 12 atomic mass units. One atomic mass unit has an actual value of 1.660538782(83)×10^−27 kg.
An atom of helium has a mass about four times greater than that of an atom of hydrogen Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses o?
the number of helium and hydrogen atoms is the same
Who said the mass of an electron is about 12000 that of a hydrogen atom?
its not, its closer to about 1/1800 of a hydrogen atom, the English chemist john Dalton was the first person to discover relative atomic masses and use them properly.
What did amedeo avogadro?
He published a paper called (translation) "Essay on determination the relative masses of the elementary molecules of bodies and the proportions by which they enter these combinations". It is from his work that we get 'Avogadro's Number' the number of molecules/atoms in a mole.
