Can anyone please help?

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f