Consider the substances below. 1 mol of beryllium
• 1 mol of salt
1 mol of water
• 1 mol of hydrogen
Which statement is true about these substances?
They have exactly the same mass.
O They have different numbers of particles.
They have the same number of atoms.
© They have different masses.
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They have the same number of atoms. = YES

They have different masses. = YES

Explanation:

1 mol of beryllium

• 1 mol of salt

beryllium  = Be = Atomic mass: 9.012182

salt  = NaCl = Molar mass: 58.44 g/mol

1 mol of water

• 1 mol of hydrogen

water  = H2O = Molar mass: 18.01528 g/mol

hydrogen = H = 1g/mole

Which statement is true about these substances?

They have exactly the same mass. = NO

They have different numbers of particles = NO

They have the same number of atoms. = YES

They have different masses. = YES

Avogadro constant means the number of units in one mole of any substance (defined as its molecular weight in grams) is equal to 6.02214076 × .

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements