Answer:
Hg(NO₃)₂(aq) + Na₂SO₄(aq) → 2NaNO₃(aq) + HgSO₄(s)
Moles of Hg(NO₃)₂ = 55.42 / 324.7 ==> 0.1707 moles
Moles of Na₂SO₄ = 16.642 / 142.04 ==> 0.1172 moles
Limiting reagent is Na₂SO₄ as it controls product formation
Moles of HgSO₄ formed = 0.1172 moles
= 0.1172 x 296.65
= 34.757g
Explanation:
The two components of a solution are solvent and solute.
A solution is a homogenous mixture, stable, and the particles are very small.
Density is simply the ratio of mass over volume. In this
case, the volume of the rock is the difference of after and before it was
dropped into the cylinder.
volume = 19.73 mL – 13.31 mL = 6.42 mL
density = 28.63 g / 6.42 mL
<span>density = 4.46 g/mL</span>
Answer:
A nucleus is a positive charge
Explanation:
A nucleus is made up of protons and neutrons. Protons have a positive charge and neutrons have a neutral charge.
Answer:
N = 603.32 × 10 ²⁰
Explanation:
Given data:
Wavelength of photon = 12.0 μm or 12 × 10 ⁻⁶ m
Energy = 1.0 KJ or 1000 j
Number of photons = ?
Solution:
Formula:
E = n . h . f
E = energy
N = number of photons
h = planck's constant
f = frequency
it is known that
f = c/λ
thus,
E = N . h . c / λ
Now we will put the values in formula.
1000 j = ( N. 6.63 × 10 ⁻³⁴ j.s × 3 × 10⁸ m/s ) / 12 × 10 ⁻⁶ m
N = 1000 j ×12 × 10 ⁻⁶ m / 6.63 × 10 ⁻³⁴ j.s × 3 × 10⁸ m/s
N = 12000 j × 10 ⁻⁶ m / 19.89 × 10 ⁻²⁶ j. m
N = 603.32 × 10 ²⁰
