During this reaction, p4 + 5o2 → p4o10, 0.800 moles of product was made in 15.0 seconds. what is the rate of reaction?

The same question exists with the following choices.

A. 56.8 g/min 
B. 227 g/min 
C. 908 g/min
D. 13,600 g/min 
 
The correct answer is letter C. 908 g/min.

Rate of reaction = change in conc of products (conc of products formed)/ time required. 
data is 0.8 moles in 15 sec. 

we can simply put it in formula and solve it but the answers are in units of g/min whereas data is in moles/sec. 
lets convert it then! 

mass in grams= moles x molar mass 

molar mass of P4O10= 31*4 + 10*16= 284grams/mole 

mass in grams = 0.8 x 284 = 227.2 g 

time = 15 s 
convert in min by dividing by 60 
t= 15/60 = 0.25min 

now put in formula = 227.2 / 0.25 = 908 g/min 

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.