Can someone me with my homework asap? it's due tonight.
3.99 mol li to g li
8.28 g co to mol co
6.17 g kr to mol kr
0.8000 mol as to g as

4.82x10^15 atoms u
8.60x10^25 atoms h
1.20x10^22 atoms o
4.01x10^23 atoms pb

27.7 grams of Li

0.140 moles of Co

0.158 moles of K

59.9 grams of As

8.00x10⁻⁹ moles of U

142.8 moles of H

0.0199 moles of O

0.666 moles of Pb

Explanation:

Mass / Molar mass = Mol

Mol . Molar mass = Mass

3.99 m . 6.94 g/m = 27.7 grams of Li

8.28 g / 58.93 g/m = 0.140 moles of Co

6.17 g / 39.1 g/m = 0.158 moles of K

0.8 mol . 74.92 g/m = 59.9 grams of As

6.02x10²³ (NA) particles are contained in 1 mol

6.02x10²³ are contained in 1 mol U 1 mol  H 1 mol O ___ 1 mol Pb

4.82x10¹⁵ atoms U   4.82x10¹⁵/ 6.02x10²³ = 8.00x10⁻⁹ moles of U

8.60x10²⁵atoms H   8.60x10²⁵ / 6.02x10²³  = 142.8 moles of H

1.20x10²² atoms O   1.20x10²² / 6.02x10²³ = 0.0199 moles of O

4.01x10²³ atoms Pb 4.01x10²³ / 6.02x10²³ = 0.666 moles of Pb

1) 27.69 grams Li

2) 0.138 moles Co

3) 0.0736 moles Kr

4) 59.94 grams As

5) 8*10^-9 moles U  = 1.9*10^-6 grams U

6) 142.81 moles H = 144.24 grams H

7) 0.0199 moles O = 0.3184 grams

8) 0.666 moles Pb = 138 grams

Explanation:

Step 1: Data given

Moles = mass / molar mass

mass = moles * molar mass

3.99 mol Li to g Li

⇒ Molar mass of Li = 6.94 g/mol

mass of Li = 3.99 grams * 6.94 g/mol = 27.69 grams

8.28 g Co to mol Co

⇒ Molar mass of Co = 58.93 g/mol

Moles of Co = 8.28 grams / 59.93 g/mol = 0.138 moles

⇒ Molar mass of Kr = 83.80 g/mol

Moles of Kr = 6.17 grams / 83.80 g/mol = 0.0736 moles

0.8000 mol As to g As

⇒ Molar mass of As = 74.92 g/mol

Mass of As = 0.8000 mol * 74.92 g/mol =  59.94 grams

4.82*10^15 atoms U

⇒ 1 mol = 6.022*10^23 atoms

4.82*10^15  = 1/6.022*10^23 * 4.82*10^15 = 8*10^-9 moles U

8*10^-9 moles U *238.03 = 1.9*10^-6 grams

8.60*10^25 atoms H

⇒ 1 mol = 6.022*10^23 atoms

8.60*10^25  = 1/6.022*10^23 * 8.60*10^25 = 142.81 moles U

142.81 moles H *1.01 = 144.24 grams

1.20*10^22 atoms O

⇒ 1 mol = 6.022*10^23 atoms

1.20*0^22  = 1/6.022*10^23 * 1.20*10^22 =0.0199 moles U

0.0199 moles O * 16g/mol = 0.3184 grams

4.01*10^23 atoms Pb

⇒ 1 mol = 6.022*10^23 atoms

4.01*10^23  = 1/6.022*10^23 * 4.01*10^23 =0.666 moles U

0.666 moles Pb * 207.2 g/mol = 138 grams

imma come back to you hold on

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error