A 42.0 g sample of compound containing only Cand H was analyzed. The results showed that the sample contained 36.0 g of C and 6.0 g of H. Which of the following questions about the compound can be answered using the results of the analysis?

Can someone me with questions 12 and 13 plz.

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?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17