Answer: Option (a) is the correct answer.
Explanation:
An independent variable is defined as a variable whose value or which is controlled in a scientific experiment. Basically, an independent variable is able to change the value of dependent variable.
The value of an independent variable can be changed by the experimenter.
For example, nature of substances in a chemical reaction will act as an independent variable.
This is because if a substance is reactive in nature then in the presence of another substance cannot become unreactive. Hence, nature of a substance is an independent variable.
Thus, we can conclude that out of the given options the nature of the substances is the independent variable.
Answer:
The correct option is;
B. -112 kJ
Explanation:
The parameters given are;
N (g) + O₂ (g) → NO (g) ΔH = 90 kJ/mol
N (g) + O₂ (g) → NO₂ (g) ΔH = 34 kJ/mol
The required chemical reaction is given as follows;
2NO (g) + O₂ (g) → 2NO₂ (g)
Therefore, the heat of formation of 2 moles of NO = 2 × 90 = 180 kJ
The heat of formation of 2 moles of NO₂ = 2 × 34 = 68 kJ
Hence, given that the heat of formation of O₂ at room temperature = 0 kJ/mol, we have;
Change in enthalpy of the chemical reaction = Heat of formation of the products - Heat of formation of the reactants
Change in enthalpy of the chemical reaction = 68 kJ - 180 kJ = -112 kJ
Change in enthalpy of the chemical reaction = -112 kJ.
Answer:
6.39 × 10⁻³ M
Explanation:
First, we will calculate the moles of HCl using the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.06 atm × 0.222 L / 0.0821 atm.L/mol.K × (26.0 + 273.15) K
n = 9.58 × 10⁻³ mol
The molar concentration of HCl is:
M = moles of HCl / liters of solution
M = 9.58 × 10⁻³ mol / 1.5 L
M = 6.39 × 10⁻³ M
Answer:
hahah animals in the world
Answer:
moon
Explanation:
the moon's gravitational pull generates tidal force which affects earth's tides