3.3 moles of sulfur
Explanation:
To find the number of moles knowing the number of atoms we use Avogadro's number to formulate the following reasoning:
if in 1 mole of sulfur (S) there are 6.022 × 10²³ atoms of sulfur (S)
then in X moles of sulfur (S) there are 2 × 10²⁴ atoms of sulfur (S)
X = (1 × 2 × 10²⁴) / (6.022 × 10²³)
X = 3.3 moles of sulfur
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Avogadro's number
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Answer:
See Below.
Explanation:
Recall that molarity is defined by moles of solute over liters of solution (mol/L).
Therefore, to make 90.0 mL of 2.0 M MgSO₄, we will need:

Convert this amount to grams. The molecular weight of MgSO₄ is 120.38 g/mol:

Therefore, to make the solution, we can add 22 grams of MgSO₄ into a graduated cylinder, then mix and dilute the solution with distilled water until we reach 90.0 mL.
Answer:
a
Explanation:
because physical changes are reversible while chemical changes are irreversible