Answer: d
explanation: in both reactants and products there are 2 hydrogen and 2 chlorine atoms
1 mole of N2 produces 2 moles of NH3
OR...
14 x 2 grams of N2 produces 2(14 +3) grams of NH3
1 gram of N2 produces 34/28 grams of NH3
therefore, 56 grams produce (34/28 )x 56 =68 grams of NH3
the answer thus would be 68 grams of NH3
Vinegar is an heterogeneous mixture
Explanation:
C.
Protons is 8 so the atomic number will be 8.
Number of neutrons= atomic mass - atomic number
16-8 = 8.
Answer:
C
Explanation:
∆H°f means the enthalpy change of formation of one mole of substance by its constituent elements under standard conditions.
So in an equation for ∆H°f, we must see 2 or more elements as reactants combining to form a compound.
In the 4 answers, only C represents elements forming a substance (Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s)),
while the others include compounds as one of their reactants.