D. Anthracite is the correct answer I’m 95% sure
Answer:
3.077 × 10¹⁴ Hz
Explanation:
f = ?
wavelength = 9.75 × 10-⁷m
using the formula,
c = wavelength × frequency
f = c/wavelength
but c(speed of light) = 3×10⁸m/s
f = 3 × 10⁸/9.75 × 10-⁷
f = 3.077 × 10¹⁴ s-¹
1) 1 second = 1000000 microseconds
2) 186000 / 1.61 = 115527.9503 Km
3) We use the equation:
Speed = distance / time
4) rearrange for distance by multiplying both sides by time to get;
Distance = speed x time
5) plug in the values:
Distance = 115527.9503 x 0.000001
= 0.1155279503 Km
Answer:
Explanation:
First you should calculate the volume of a big sphere,so:
Then you calculate the volume of a small spehre, so:
Finally you subtract the two quantities:
Answer:
Explanation:
The equation tells you that for every mol of H2 you need 2 mols of Na to get it.
1 H2 / 4 mols H2 = 2 mols Na / x Cross multiply
1*x = 4 * 2
x = 8 mol Na