The mass of Methane gas (CH4) in kg is .571kg. You multiply the number of moles of CH4 by the atomic mass of CH4 to get you answer in grams. Then, you divide the answer by 1000 to get your answer into kilograms. <span />
Answer: K is a metal, it has 1 valence electron, and it appears white with a gray luster, conducts heat and electricity, and has a low melting point.
Explanation: K is in Group 1 of the periodic table. All elements in group 1 have 1 valence electron, in the s orbital for that energy level. (4s^1 for K). Since it is a metal, it has the expected properties of conducting heat and electricity, and low melting point.
It is called deposition.
Bcoz,
Sublimation - transformation from solid to gas,
Condensation - gas to liquid transformation
Vaporization - liquid to gas transformation
Answer:
C) 10,500 years.
Explanation:
- The decay of cobalt-60 is a first order reaction.
- The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5272 year) = 1.314 x 10⁻⁴ year⁻¹.
The integration law of a first order reaction is:
kt = ln [A₀]/[A]
k is the rate constant = 1.314 x 10⁻⁴ year⁻¹.
t is the time = ??? years.
[A₀] is the initial percentage of cobalt-60 = 25.0 g.
[A] is the remaining percentage of cobalt-60 = 6.25 g.
∵ kt = ln [Ao]/[A]
∴ (1.314 x 10⁻⁴ year⁻¹)(t) = ln (25.0 g)/(6.25 g)
(1.314 x 10⁻⁴ year⁻¹)(t) = 1.386.
∴ t = 1.386/(1.314 x 10⁻⁴ year⁻¹) = 10,550 years ≅ 10,500 years.
B. Radiation
Thermal energy from the sun fto Venus.
