Answer:
No. of protons = 34
Explanation:
First we need to calculate the number of electrons in one mole of the the element:
No. of electrons per mole = Total Mass of Electrons/Mass of 1 Electron
No. of electrons per mole = (18.65 x 10⁻³ g)/(9.109 x 10⁻²⁸ g)
No. of electrons per mole = 2.04 x 10²⁵ electrons/mol
Now, we calculate the no. of electrons in 1 atom:
No. of electrons per atom = No. of Electrons per mole/No. of atoms per mole
No. of electrons per atom = (2.04 x 10²⁵ electrons/mol)/(6.022 x 10²³ atoms/mol)
No. of electrons per atom = 34 electrons/atom
Since, the no. of protons in a pure element are equal to the number of electrons. Therefore,
<u>No. of protons = 34</u>
Answer:
Dispersants
Dispersants are generally detergents or surfactants that help dissolve the oil stain in smaller drops. They remove oil from the water surface, making it enter and into the water column, increasing the speed of biological degradation. These dispersants, by removing oil from the water surface, protect birds, marine mammals, turtles and sensitive coasts. Chemical dispersants do not sink oil leaving it suspended in the water column. Dispersants should be avoided in shallow coastal waters, mangroves, swamps, or waters over coral reefs and algae due to their possible toxicity.
Explanation:
Answer:
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Answer:
+43.32 kJ
Explanation:
Step 1: Write the thermochemical equation for the decomposition of sodium nitride
2 Na₃N ⇒ N₂ + 6 Na ΔH = +42.7 kJ
Step 2: Calculate the moles corresponding to 168.4 g of Na₃N
The molar mass of Na₃N is 82.98 g/mol.
168.4 g × 1 mol/82.98 g = 2.029 mol
Step 3: Calculate the heat needed for the decomposition of 2.029 moles of Na₃N
According to the thermochemical equation, 42.7 kJ are required for the decomposition of 2 moles of Na₃N. The heat needed for the decomposition of 2.029 moles of Na₃N is:
2.029 mol × 42.7 kJ/2 mol = 43.32 kJ