What is meant by a pure substance?

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The purity of a substance is the measure of the extent to which a given substance is pure.
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Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.
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Nasar
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What are alloys?
It is mixture of metals example steel,bronze. Bronze is alloy of aluminium,nickel or zinc and manganese. Steel is made of iron,chromium also small percentage of carbon,nickel,
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What is meant by the term chemical formula?
Chemical formula is an expression which shows the number and type of atoms present in one molecule of a substance. Atoms are denoted by their symbols. For example the chemical formula for water is H2O...
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Probodh
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Calculate the mass of 0.5 mole of N2 gas (mass from mole of molecule).
Molar mass of N2 is 28(since atomic weight of nitrogen is 14and forN2=14*2). So mass of 1 mole of N2 is 28g.Therefore mass of 0.5 mole is 28/2 =14g
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Neha
If number of electrons in an atom is 8 and number of protons is also 8, then (i)what is the atomic number of the atom? and (ii) what is the charge on the atom?
As given no. of protons is 8 so the atomic no. would be 8... As no. of protons and no. of electrons are equal so the atom will be neutral...
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Rajendra
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Basics of Nucleic Acid (part 2)
Now let's move on to RNA i.e Ribonucleic Acid. RNA is also macro molecule made up with polymer of nucleotides. One of the major difference between DNA and RNA is that unlike DNA, RNA is single stranded....
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