$CATEGORY: Science - TicTacLearn/3. Atoms and molecules/3. Atoms and molecules--Molecular Mass

//Multiple Choice

The molecular mass is\:
{
~The number of molecules in a mole
~The number of atoms in a molecule
=Sum of the atomic mass of all the atoms in a molecule
~The mass of a single atom
}

What is the formula unit mass of potassium carbonate?
{
~122 u
=138 u
~96 u
~80 u
}

The mole concept was introduced by\:
{
=Avogadro
~Dalton
~Rutherford
~Thomson
}

One mole of a substance is equal to\:
{
~ \(6.022 × 10²² particles\)
~ \(1.66 × 10²⁴ particles\)
~ \(1.66 × 10²³ particles\)
= \(6.022 X 10²³ particles\)
}

What will be the gram atomic mass of oxygen if its atomic mass is 16 u?
{
~32 g
~16 u
=16 g
~8 g
}

What do chemists require to conduct the reactions?
{
~Number of atoms only
~Number of molecules only
=Both (a) and (b)
~None of these
}

Which of these substances contains 6.022 × 10²³ molecules in 1 mole?
{
~Sodium chloride (NaCl)
~Carbon-dioxide (CO₂)
~Oxygen gas (O₂)
=All of these
}


//True or False

The molecular mass is expressed in the atomic mass unit.{T}

The molecular mass of water is 17 u.{F}

The number of particles in one mole of any substance is always constant.{T}

The unit for molar mass is unified atomic mass units (u).{F}

The number of moles is the same as the number of molecules in 1 mole of a substance.{F}

69 grams of sodium contains 3 moles of Sodium.{T}

The atomic mass of an element is always a whole number.{F}

The molecular mass of carbon dioxide (CO₂) is 44 u.{T}

Avogadro's number calculates the number of molecules in a mole.{T}

The mole concept helps in converting between the number of particles and mass.{T}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Avogadro's number -> 6.022 X 1023 particles
=Molar volume at STP -> 22.4 L
=Molar mass of nitrogen (N) -> 14.007 g/mol
=One mole of carbon atoms -> 12 g
}

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