Question

1. Balance the reaction below. The sum of the coefficients is __.

__Al + __ O₂ -> __Al₂O₃

Select one:

a. 3

b. 7

c. 9

d. 5

2.You are making smores with that require 1/2 graham cracker, 1 marshmallow, and 4 squares of chocolate. You have 9 whole graham crackers, 23 marshmallows, and 32 squares of chocolate. Which ingredient will you run out of first?

Select one:

a. graham crackers

b. chocolate

c. marshmallows

Answer 1

1)

The reaction is:

Al + O2 -> Al2O3

Balance O:

Al + 3 O2 -> 2 Al2O3

Balance Al:

4 Al + 3 O2 -> 2 Al2O3

The reaction is now balanced.

Sum of coefficient = 4 + 3 + 2 = 9

Answer: c

Only 1 question at a time please