Answer:
The answer to your question is 2.92 x 10⁻⁶ g
Explanation:
Data
mass of K = ?
atoms of K = 4.50 x 10¹⁶
Process
To answer this question just remember that the atomic mass of any element is equivalent to Avogadro's number.
1.- Look for the atomic number of Potassium
Atomic number = 39.10 g
2.- Use proportions and cross multiplication
39.10 g of K --------------- 6.023 x 10²³ atoms
x ----------------4.50 x 10¹⁶ atoms
x = (4.50 x 10¹⁶ x 39.10) / 6.023 x 10²³
-Simplify
x = 1.7595 x 10¹⁸ / 6.023 x 10²³
-Result
x = 2.92 x 10⁻⁶ g
Desert soil has poor topsoil and hardly any organic material in it.
This is because regularly watered soil provides the perfect environment for certain bacteria, bugs and other organisms to grow which in turn provide quality topsoil.
In a desert with very little rain, the perfect environment is never produced, which results in a lot of minerals but poor topsoil for any quality agriculture to take place.
Answer:
the answer is b
Explanation:
Physical changes affect a substance's physical properties but do not alter its chemical structure. Types of physical changes include boiling, clouding, dissolution, freezing, freeze-drying, frost, liquefaction, melting, smoke and vaporization.
Answer:
0.0794 L
Explanation:
An experiment requires 62.7 g of ethyl alcohol. The density of ethyl alcohol is 0.790 g/mL. The volume, in milliliters, corresponding to 62.7 g of ethyl alcohol is:
62.7 g × (1 mL/0.790 g) = 79.4 mL
1 liter is equal to 1000 milliliters. The volume, in liters, corresponding to 79.4 mL is:
79.4 mL × (1 L/ 1000 mL) = 0.0794 L