Question

- 257.53 12. Convert the mass of the following compounds to moles (3 points per compound 6 points total) moles a. 45 grams Naci b. 37 grams of NHF2 moles 13. For the following chemicalranntinne identify then

Answer 1

Answer 12):-

Formula :-

Number of moles = Mass (in grams) / Molar mass

a):-

Mass of NaCl = 45 g

Molar mass of NaCl = (1 × molar mass of Na + 1 × molar mass of Cl) = ( 1 × 23 + 35.45) = 58.45 g/mole

Number of moles of NaCl = Mass ÷ molar mass = (45 g) ÷ (58.45 g/mole) = 0.77 moles

Hence, 45 grams of NaCl = 0.77 moles  

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​​​b):-

Mass of NHF₂ = 37 g

Molar mass of NHF₂ = (1 × molar mass of N + 1 × molar mass of H + 2 × molar mass of F) = (1 × 14 + 1 × 1 + 2 × 19) = 53 g/mole

Number of moles of NHF₂ = Mass ÷ molar mass = (37 g) ÷ (53 g/mole) = 0.698 moles

Hence, 37 grams of NHF₂ = 0.698 moles

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