Answer:
It must be large
Random
Explanation:
For a sample to represent a population accurately, it must be large and contain random sample spaces.
A population is a group of organism of the same species living in a particular place where they can reproduce.
- A sample must be representative of a given population
- By so doing, sampling space must be large so as to properly represent the species there in.
- The sampling must be done without any bias i.e. it must be randomly carried out.
Answer:
1.40
Explanation:
8.45×
× 
= 1.40318 ≈ 1.40 mol
Answer:
29.3 g HClO₄
Explanation:
We have 39.1 grams of 74.9 wt% aqueous perchloric acid solution, that is, there are 74.9 grams of perchloric acid in 100 grams of perchloric acid solution. The mass, in grams, of perchloric acid contained in 39.1 grams of perchloric acid solution is:
39.1 g Solution × (74.9 g HClO₄/100 g Solution) = 29.3 g HClO₄
