The answer is 2 15 12 6
hope this would help you
2Pb(NO₃)₂ = 2PbO + 4NO₂ + O₂
m{Pb(NO₃)₂}=9.9 g
m'{PbO}=5.5 g
M{Pb(NO₃)₂}=331.2 g/mol
M{PbO}=223.2 g/mol
w-?
w=m'{PbO}/m{PbO}
m{PbO}=M{PbO}m{Pb(NO₃)₂}/M{Pb(NO₃)₂}
w=m'{PbO}M{Pb(NO₃)₂}/[M{PbO}m{Pb(NO₃)₂}]
w=5.5*331.2/[223.2*9.9]=0.8244 (82.44%)
We know that
Speed of light = wavelength X frequency
Energy of light = h X frequency
Where
h = planck's constant = 6.626 x 10–34 j·s
frequency = speed of light / wavelength = 2.998 x 10^8 m/s / 656.3 X 10^-9
frequency = 4.57 X 10^14 / s
Energy = 6.626 x 10–34 j·s X 4.57 X 10^14 / s = 3.028 X 10^-19 Joules
A. Strong Acid vs. Strong Base
Answer:
2. 1 gram of Uranium (U)
Explanation:
1.
1 g Be x 1 mol/ 9.012182 g = 0.1109609193 mol Be
0.1109609193 mol Be x 6.0221409e+23/ 1 mol = 6.68x10^22 atoms of Be
2.
1 g U x 1 mol/ 238.0289 g = 4.20117053x10^-03 mol U
4.20117053x10^-03 mol U x 6.0221409e+23/ 1 mol = 2.53x10^21
3.
1 g S x 1 mol/ 32.066 g = 0.03118567954 mol S
0.03118567954 mol S x 6.0221409e+23/ 1 mol = 1.88x10^22
4.
1 g Fe x 1 mol/ 55.847 g = 0.01790606478 mol Fe
0.01790606478 mol Fe x 6.0221409e+23/ 1 mol = 1.078328451x10^22
