1.- How many grams of gold (Au) are there in 15.3 moles ofAu? 2.- Which of the f

Question

1.- How many grams of gold (Au) are there in 15.3 moles ofAu? 2.- Which of the following has greater mass: 2 atoms of leador 5.1 x 10-23 mole of helium? And which has more atoms:1.10 g of hydrogen atoms or 14.7 g of chromium atoms? 3.- How many molecules of ethane (C2H6)are present in 0.334 g of C2H6? 1.- How many grams of gold (Au) are there in 15.3 moles ofAu? 2.- Which of the following has greater mass: 2 atoms of leador 5.1 x 10-23 mole of helium? And which has more atoms:1.10 g of hydrogen atoms or 14.7 g of chromium atoms? 3.- How many molecules of ethane (C2H6)are present in 0.334 g of C2H6?

Explanation / Answer

1) 15.3molAu x (196.967g/ 1mol) = 3013.5951g 2) 2atoms Pb x (1mol/6.022E23 atoms) x (207.2g/1mol) = 6.88E-22g (5.1E-23mol He)(4g/1mol) = 2.04E-22g; 2 atoms of lead have moremass (1.10gH)(1mol/1g)(6.022E23atoms/1mol) = 6.624E23 atoms (14.7gCr)(1mol/ 51.996g)(6.022E23atoms/ 1mol) = 1.7025E23 atoms;1.10g of hydrogen has more atoms 3) 0.334gC2H6(1mol/30g)(6.022E23molecules/1mol) = 6.7045E21molecules

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