Why did Arrhenius say that acids must be having hydrogen in it?

How manyatoms of mercury are in 1.4214e+1 ml sample

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)