Answer:
The wavelength of radio wave is 3m
Explanation:
speed of r.w (v) = 3 × 10⁸ m/s
frequency (f) = 1 × 10⁸ Hz
wavelength (λ) = ?
![v = f λ](https://tex.z-dn.net/?f=v%20%20%3D%20f%20%CE%BB)
λ = v/f
= (3 × 10⁸) ÷ (1 × 10⁸)
= 3m
(Correct me if i am wrong)
Answer:
27.38 g
Explanation:
- CH₃NO₂ (l) + 3O₂ (g) → 4CO₂ (g) + 6H₂O (l) + 2N₂ (g) ΔHorxn = -2836 kJ
The value of ΔHorxn tells us that when 1 mol of CH₃NO₂ is burned, 2836 kJ of heat are produced. With that in mind we can<u> calculate how many moles of CH₃NO₂ were burned when 1273 kJ of heat were produced</u>:
- 1273 kJ * 1mol / 2836 kJ = 0.4489 mol
Then we <u>convert 0.4489 moles of CH₃NO₂ to grams</u>, using its <em>molar mass</em>:
- 0.4489 mol * 61 g/mol = 27.38 g
The molarity of Sr(OH)2 solution is = 0.1159 M
calculation
write the equation for reaction
that is, Sr(OH)2 +2HCl→ SrCl2 + 2 H2O
then finds the mole of HCl used
moles = molarity x volume
=40.03 x0.1159 = 4.639 moles
by use of mole ratio between Sr(OH)2 to HCL which is 1 :2 the moles of Sr(OH)2 is therefore = 4.639 x1/2 = 2.312 moles
molarity of Sr(OH)2 is = moles / volume
=2.312 /20 =0.1159 M