Answer:
Both
Explanation:
The combined gas law is also known as the general gas law.
From the ideal gas law we assume that n = 1;
So;
PV = nRT
and then;
=
If we cross multiply;
P₁V₁T₂ = P₂V₂T₁
So;
T₁ =
Also;
V₂ =
So from the choices both are correct
Answer:
C) by converting hydrogen to helium.
Explanation:
The Sun keeps shining because of nuclear fusion processes, which consists in creating helium atoms by combining hydrogen atoms, of an atomic mass less that of helium, in conditions of high core pressure and temperature. In other words, the Sun keeps shining by producing helium at the expense of its hydrogen reserves.
Therefore, the correct answer is C.
there is always the same number of atoms at start and end, no atoms 'disappear' and none are 'made'
Answer:
D. C + 2H₂ + ¹/₂O₂ → CH₃OH
Explanation:
The standard enthalpy of formation -ΔHf- is defined as the enthalpy change for the formation of 1 mol of a compound from its component elements.
Component elements are any element in its standard state.
For CH₃OH(l) at 25°C and 1 atm of pressure, the component elements are C(s), H₂(g) and O₂(g)
Thus, the equation that represent the standard enthalpy of formation of CH₃OH(l) is:
D. C + 2H₂ + ¹/₂O₂ → CH₃OH
I hope it helps!
As less heat will escape out of the house. Heat escapes out the loft, window or floors