Hydrazine (N2H4) is often used as a rocket fuel. It can be produced from the elements by reacting nitrogen gas (N2) with another substance. What is the correct amount of the substance that would react with nitrogen gas to form one mole of hydrazine?
A. H2
B. 2 H2
C. 2NH2
OD. 4 NH

Who is better, messi or cristiano, i need this for a chemistry class. asap

What is the composition, in atom percent, of an alloy that consists of 4.5 wt% pb and 95.5 wt% sn? the atomic weights for pb and sn are 207.19 g/mol and 118.71 g/mol, respectively.(a) 2.6 at% pb and 97.4 at% sn(b) 7.6 at% pb and 92.4 at% sn(c)97.4 at% pb and 2.6 at% sn(d) 92.4 at% pb and 7.6 at% sn

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change