PLEASE HELP I have beens tuck on this for a week i really need to finish it fast.

Chemistry
Tutor: None Selected Time limit: 1 Day

Sub-Atomic How many moles of magnesium, Mg, are there in 4.75 grams of magnesium?Particles: What is the mass in grams of 3.5 mol of the element gold, Au?

How many moles of mercury, Hg, are in 1.30 x 107 atoms of mercury?
Nov 20th, 2014

How many moles of magnesium, Mg, are there in 4.75 grams of magnesium?

Answer:

n (Mg) = m(Mg) / M(Mg) = 4.75g / 24 g/ mol = 0.198 mol 


What is the mass in grams of 3.5 mol of the element gold, Au?

Answer:

m (Au) = M(Au) * n(Au) = 3.5 mol *  197 g/ mol = 689.5  g


How many moles of mercury, Hg, are in 1.30 x 107 atoms of mercury?

n (Hg) = N(Hg) / N (A) 

N (A)  = 6.02 * 10^23 mol-1

n (Hg) =  1.30 * 10^7 / 6.02 * 10^23 mol-1 = 2.16 * 10^ -16 mol


Please chose as the best. 

Best regards

Maxim

Thank you!

Nov 20th, 2014

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