I need these ASAP

Im doing an open-book assignment and have 13 minutes left. Thank you!!

Step-by-step explanation:

hope it's helpful to you

the value of b is 14 after converting into nearest hundredth.

Step-by-step explanation:

this solution is for question no 18

< i think this is the answer unless i did my math wrong

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.