After 65 minutes a 5 g sample of francium had decayed to 0.645 g. What is the half-life of this isotope of francium?

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.

What are the coefficients to balance the following equation? ba+br2=babr2

How do you interpret a chromagram for what mixtures contain?