Molar mass of Li = 6.9 g/mol
6.9 g -------------------- 6.0x10²³ atoms
g -------------------- 2.75x10^21 atoms
6.0x10²³ g = 6.9 * (2.75x10^21)
6.0x10²³ g = 1.8975x10²²
g = 1.8975x10²² / 6.0x10²³
x = 0,0317 g
answer b
hope this helps!.
Your body changes your body and it deadges.
1. Calcium
2. Fluorine
3. Chlorine
4. Iodine
5. Neon
6. Aluminum
7. Copper
8. Mercury
9. Chromium
10. Lead
11. Carbon
12. Sulfur
13. Iron
14. Tungsten
15. Arsenic
16. Uranium
17. Hydrogen
18 Magnesium
3.91584 molecules in 122g of Cu(NO3)2
Answer:
14 % (to the nearest percentage)
Explanation:
We must first obtain the molar mass of diethyl ether rom its molecular formula, C4H10O.
relative atomic mass of carbon =12, hydrogen =1 oxygen -16
Hence we have;
(4*12) + (10*1) +16 = 48 + 10 + 16 = 74g/mol
mass percent = total mass of hydrogen/ molar mass of compound * 100
% by mass of hydrogen = 10/74 * 100 = 14 % (to the nearest percentage)