Be sure to answer all parts. the natural abundances of the two stable isotopes of hydrogen (hydrogen and deuterium) are 99.99 percent and 0.01 percent. assume that water exists as either 1 1 h2o or 2 1 d2o. calculate the number of d2o molecules in 300.0 ml of water (density = 1.00 g/ml). enter your answer in scientific notation.

The number of D₂O molecules in 300.0 mL of water are 1,003x10²¹

Explanation:

First, you need to know in 300 mL of water how many moles of hydrogen and deuterium are. Then, you must use Avogadro's number to obtain the number of molecules.

In 300 mL of water you have:

=

16,65 moles of H₂O and D₂O

As the 0,01 percent of these moles are D₂O:

16,65 mol × 0,01% = 1,665x10⁻³ mol of D₂O

That in number of molecules are:

=

1,003x10²¹ molecules of D₂O

I hope it helps!

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.