1. determine the number of atoms in 2.50 mol zn.
2.so molznxlmolo
"6.02x10

15.1  × 10²³ atoms

Explanation:

Given data:

Number of moles of Zn = 2.50 mol

Number of atoms = ?

Solution:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 2.50 mole of Zn:

one mole of zinc = 6.022 × 10²³ atoms

2.50 × 6.022 × 10²³ atoms

15.1  × 10²³ atoms

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

b) nuclear ive learned that in a pedtrodic table