Answer: 126
Explanation: The sum of protons and neutron in an atom make up an atom's atomic mass and each element has a specific amount of protons. Because of this, you can find the amount of neutrons by subtracting the number of protons from the total mass of an atom.
Answer:
53.3 g C6H6
Explanation:
C₆H₆(l) → 3 C₂H₂(g) ∆H= 630 kj
From reaction 1 mol ∆H= 630 kj
Given x mol ∆H= 430 kj
x = (1 mol*430 kJ)/630 kJ = 0.683 mol C6H6
M(C6H6) = 12*6 + 1*6= 78 g/mol
0.683 mol C6H6 * 78 g/mol ≈ 53.3 g
Answer:
There are 2 carbon atoms present.