What is the mass in grams of 1.69 moles of phosphoric acid?
Correct answer: D. 166 g
- A. 148 g
- B. 138 g
- C. 157 g
- D. 166 g
Explanation
Phosphoric acid is H3PO4. Its molar mass is 97.9 g/mol. To find the mass we use the formula;mass = moles × molar massmass = 1.69×97.994=166g
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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