A chemist weighed out 3.61 g of potassium. Calculate the number of moles of potassium she weighed out. Be sure your answer has the correct number of significant digits.

To calculate the number of moles of potassium (K), you can use the formula: Number of moles = mass (g) / molar mass (g/mol). The molar mass of potassium is approximately 39.10 g/mol. So, plugging in the values: Number of moles = 3.61 g / 39.10 g/mol ≈ 0.09222 moles. Now, rounding to the correct number of significant figures (which is 3 based on the given mass of 3.61 g), the number of moles of potassium is approximately 0.0922 moles. Did you know potassium was discovered in 1807 by Sir Humphry Davy using electrolysis? It's a fascinating element that plays a crucial role in various biological processes, from regulating heartbeat to muscle function! In practical terms, potassium is vital in fertilizers, and understanding its molar quantities helps farmers optimize crop yields. By knowing how much potassium to apply based on soil tests, they can promote healthier plant growth, leading to better produce and feeding more people!