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science question?
Please help me with my science homework! I run my homework (due tomorrow) But I could not get those questions. Please help! 1. The price of gold (molecular weight = 196.97 g / mol) varied much over the last 30 years that $ 100 you can buy as many as 2.6 troy ounces (81 grams) of gold or as little as 0.13 oz troy (4.0 g). Calculate the amount in moles that these two bodies are gold. 2. Osmium (molar mass = 190.23 g / mol) and iridium (Molar mass = 192.22 g / mol) the highest densities of all elements. One cubic centimeter of the other element has a mass of about 22.6 g. Determine the quantity of 22.6 moles of each element.
Use this formula (as necessary reorganize it) to work on: Check your answers with your book. It's been a while since I did chemistry. mol x molar mass molar mass = grams = grams / mole or moles = g / molar mass for example: for 100 $ You can get 81g/196.97 = 0.411 mol of gold.
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