Calculate the number of grams of calcium perchlorate (Ca(ClO4)2) in 6.37 x 1018 formula units of calcium perchlorate?

2.53x10⁻³g of Ca(ClO₄)₂

Explanation:

It is possible to convert formula units to moles using Avogadro's number and then, these moles to grams with molar mass, thus:

6.37x10¹⁸F.U. ₓ (1mole / 6.022x10²³F.U.) = 1.06x10⁻⁵ moles of Ca(ClO₄)₂

Molar mass of Ca(ClO₄)₂ is:

1 Ca = 1×40.08g/mol = 40.08g/mol

2 Cl = 2×35.45g/mol = 70.90g/mol

8 O = 8×16g/mol = 128g/mol

Molar mass:

40.08g/mol + 70.90g/mol + 128g/mol = 238.98g/mol

Thus, mass of 1.06x10⁻⁵ moles of Ca(ClO₄)₂ is:

1.06x10⁻⁵ moles of Ca(ClO₄)₂ × (238.98g/mol) = 2.53x10⁻³g of Ca(ClO₄)₂

3 hours because it is a decent distance.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !