On the basis of the given data:
Volume (V) is 37.5 L
Temperature (T) is 307 K
Pressure (P) is 1.25 atm
In order to calculate the number of moles, the formula to be used is PV = nRT, Here R is 0.0821 Latm/mol/K
n = PV / RT
n = 1.25 atm × 37.5 L / 0.0821 Latm/mol/K × 307 K
n = 1.85 mol
Answer:
The 4th option
a possible explanation of or answer to a scientific question
Explanation:
You can identify a mineral by its appearance and other properties. The color and luster describe the appearance of a mineral, and streak describes the color of the powdered mineral.
To determine the limiting reactant, we first calculate the number of moles of the reactant.
7.00 g H2 ( 1 mol / 2.02 g ) = 3.47 mol H2
70.00 g N2 ( 1 mol / 28.02 g) = 2.50 mol N2
From the balanced reaction, we see that there is a 3 is to 1 ratio of the reactants. So, for every 3 moles of H2 we need 1 mole of N2. Given the amount of reactant, for 2.50 moles of N2 we need 7.5 moles of H2 which obviously we have a lesser amount. Hydrogen is the limiting reactant.
Answer: four electrons
Explanation:
Each bond is formed by a pair of electrons. So, two bond involve two pairs of electrons, which is 2 * 2 = 4 electrons.
The Lewis structure for a doble bond is:
X : : X
where the dots represent the electrons, and one dot beside other dot is a pair of electrons formin a bond.
So, there you have two pair of electrons representing two bonds or one double bond.
