Calculate the formula mass and the molar mass of ammonium sulfate, (NH_4)_2 SO_)

Question

Calculate the formula mass and the molar mass of ammonium sulfate, (NH_4)_2 SO_)_4. a) Show total number of atoms of cach element in the formula a) b) Show the calculation steps with unit attached in each step using the correct format c) Formula mass = d) Molar mass = 2 Use the molar mass information you have in question 1 above to solve the problems below. You must attach the formula of the compound in the set up. (See setup in example 9.7). You must write calculator value (c.v.) and final value (f.v.) 2a How many grams (g) of (NH_4)_2 SO_4 are in 0.653 mole of this compound? Write the correct conscrsion factor you should use: Show setup and calculation steps using corrcet conversion factor and formula (example 9.7): 2b How many moles of (NH_4)_2 SO_4 are present in 0..545 g of this compound: Write Correct conversion factor you should use:rightarrow Show setup and calculation steps using correct conversion factor and formula (example 9.7):

Explanation / Answer

(NH4)2SO4

a)

No. of atoms

N = 1 * 2 = 2

H = 4 * 2 = 8

S = 1

O = 4

b)

Mass of atoms

N = 2 * 14 = 28 g/mol

H = 8 * 1 = 8 g/mol

S = 1 * 32.06 = 32.06 g/mol

O = 4 * 16 = 64 g/mol

c) Formula Mass = Molar mass = 28 + 8 + 32.06 + 64 = 132.06 g/mol

2 a)

Moles of compound = 0.653 moles

Mass of compound = 0.653 * 132.06 = 86.24 g

2 b)

Mass of compound = 0.545 g

Moles of compound = 0.545/132.06 = 0.0041 moles or 4.1 millimoles

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