(HELP QUICK JSJJKDSDSDJKSD) Using the correct set of coefficients needed to balance the chemical equation in the previous problem:

___ Fe2O3 + ___ Al → ___ Fe + ___ Al2O3

How many grams of aluminum will be needed to react in order to form 15.0 g iron?

Group of answer choices

2.57 g

7.25 g

2.75 g

5.27 g

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?