How do you calculate molar mass? For example, what is the molar mass of #Cu(NH_4)_4SO_4#?

Answer 1

Well, this is simplicity itself; add the atomic mass of copper plus the atomic mass of sulfur...............plus 16 times the atomic mass of hydrogen.

#"Molecular mass of "CuSO_4*(NH_4)_4# #=#

#(63.55+32.06+4xx16.00+4xx14.01+16xx1.00794)*g*mol^-1~=250*g*mol^-1#

Are you satisfied with this? All I did was add up the molar masses of each individual element and weight it based on where it appears in the formula.

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Answer 2

Wyatt Adkins

To calculate the molar mass of a compound, you sum the atomic masses of all the atoms in the compound, taking into account the subscripts for each element and any coefficients present. For Cu(NH₄)₄SO₄:

Cu: 1 atom, atomic mass = 63.55 g/mol N: 4 atoms, atomic mass = 14.01 g/mol H: 8 atoms, atomic mass = 1.01 g/mol S: 1 atom, atomic mass = 32.07 g/mol O: 4 atoms, atomic mass = 16.00 g/mol

Molar mass = (1 * 63.55) + (4 * 14.01) + (8 * 1.01) + 32.07 + (4 * 16.00) = 256.42 g/mol

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.