How many atoms are in 1.4 mol of phosphorus trifluoride (pf3)?

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3no2(g)+h2o(l)→2hno3(l)+no(g) part a suppose that 4.2 mol no2 and 0.50 mol h2o combine and react completely. which reactant is in excess? express your answer as a chemical formula. nothing

What semimetal can form four single covalent bonds.

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge