# What is the molar mass of sodium phosphate?

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## Answer  Laura

The molar mass of sodium phosphate Na3PO4 is 164gmol−1

Molar mass of sodium phosphate = (3×23 Na + 1×31 p+4×16 O) =164gmol−1

Sodium phosphate is a conventional term for an assortment of salts of sodium (Na+) and phosphate (PO4−3). Tri sodium phosphate, otherwise called sodium phosphate, is a chemical compound with the equation Na3PO4. It is essential. It once in the past was utilized in cleansers, however the phosphate energized algal sprouts. It is made by consolidating sodium hydroxide and phosphoric corrosive. The Monosodium phosphate (MSP), otherwise called monobasic sodium phosphate and sodium dihydrogen phosphate, is an inorganic compound of sodium with a dihydrogen phosphate (H2PO4) anion.

Example 1

What is the molar mass of sodium hydroxide?

Solution

The molar mass of sodium hydroxide NaOH is 39.997 g/mol

(23×1 Na) + (16×1 O)+ (0.997×1) = 39.997 g/mol

Example 2

What is the molar mass of Sodium Oxide ?

Solution

Molar mass of sodium oxide NaO is 61.9789 g/mol

(23×1 Na) + (16×1 O) = 61.9789 g/mol

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##### 2. (11 marks) a) At 400 °C, ammonium iodide decomposes in the following endothermic reaction: NH41(s) + NH3(g) + HI(g) Kp = 0.215 at 400 °C. Write the equilibrium expression for this reaction. 15.0 g of NH4I was placed in an empty 3.0 L flask and heated to 400 °C. What is the partial pressure of NH3 in the flask once the reaction has reached equilibrium? How would the following changes to the equilibrium mixture affect the number of moles of NH3 in the flask and the value of K, once equilibrium is re-established? (Use increase, decrease or stay the same.) Change Effect on moles of NH3 Ke value Increase temperature Increase volume of flask Remove half of HI gas
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