How many moles of sodium are present in 0.1 g of sodium?
Correct answer: A. 4.3 x 10^-3
- A. 4.3 x 10^-3
- B. 4.03 x 10^-1
- C. 4.01 x 10^-2
- D. 4.3 x 10^-2
Explanation
To calculate the number of moles of sodium present in 0.1g of sodium, we need to use the molar mass of sodium (Na), which is approximately 22.99 g/mol.The number of moles (n) can be calculated using the formula:n = mass / molar massn = 0.1g / 22.99 g/moln ≈ 0.00434 molRounded to two decimal places, the number of moles of sodium in 0.1g of sodium is approximately 0.0043 mol.4.3 x 10-3 (0.0043) - This matches the calculated value.
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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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