In lab you determined the volume of 12 marbles and the mass of 18.0 mL of water.

Question

In lab you determined the volume of 12 marbles and the mass of 18.0 mL of water. Use the following data, which should closely approximate your results, to answer the questions below. What are the densities determined from the data above? (Sig Fig Hint: Use the precision of the mass of water and volume of marbles to determine the correct number of significant figures for all answers.) The number of moles of water present in 18.0 g of water is mol. Use scientific notation for the number of water molecules in 18.0 g of water. (Type your answer using the format 2.2e21 for 2.2 times 1021.) What is the mass of a single molecule of water? How many water molecules would have the mass of one marble? Neglect empty space between molecules and calculate the average volume of a water molecule. What is the average volume of a marble? How many water molecules could fit in the same volume as one marble? Note: The population on earth is about 6. times 109 people and there are about 4. times 1011 stars in the Milky Way galaxy!)

Explanation / Answer

since a to c u have done d)mass of single molecule of water=18/(6.03 *10^23)=2.988 *10^-23 g e)mass of 1 marble=48.24/12=4.02 g no of molecule=4.02/18 *6.03 *10^23=1.345*10^23 f)average volume of water molecule=12 ml/(6.023*10^23)=1.99 *10^-23 ml g)average volume of marbel=23.8/12=1.98 ml h)no of water molecules=1.98/(1.99 *10^-23) =0.99 *10^23

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