135 mg of tungsten contains 4.43 × 10²⁰ atoms of tungsten (3.05 × 10⁻²² g/atom).
First, we will convert 135 mg to grams using the conversion factor 1 g = 1000 mg.
![135 mg \times \frac{1g}{1000mg} = 0.135 g](https://tex.z-dn.net/?f=135%20mg%20%5Ctimes%20%5Cfrac%7B1g%7D%7B1000mg%7D%20%3D%200.135%20g)
The mass of a single tungsten atom is 3.05 × 10⁻²² g. The number of atoms in 0.135 g of tungsten is:
![0.135 g \times \frac{1atom}{3.05 \times 10^{-22}g } = 4.43 \times 10^{20}atom](https://tex.z-dn.net/?f=0.135%20g%20%5Ctimes%20%5Cfrac%7B1atom%7D%7B3.05%20%5Ctimes%2010%5E%7B-22%7Dg%20%7D%20%3D%204.43%20%5Ctimes%2010%5E%7B20%7Datom)
135 mg of tungsten contains 4.43 × 10²⁰ atoms of tungsten (3.05 × 10⁻²² g/atom).
You can learn more about unit conversion here: brainly.com/question/19420601
Answer:
Option 3. Specific heat capacity of the liquid
Explanation:
Let's think, the states for the substance.
In -10, substance turns from solid state to liquid, so at 2°C , state is liquid.
We have to take from liquid state at 2°C to 155°C, which is the boiling point.
As the substance doesn't change its state, we only have to apply the specific heat capacity of the liquid.
1. specific heat capacity of the solid → This is used, when the substance is solid.
2. Heat of fusion → Only used when you turn from liquid to solid
4. Heat of vaporization → Used when the substance changes its state from liquid to gas
5. specific heat capacity of the gas → Used when the substance is a gas.
Answer:
0.322630 mols
Explanation:
![\frac{21.0g Zn solid}{65.09 Zn}](https://tex.z-dn.net/?f=%5Cfrac%7B21.0g%20Zn%20solid%7D%7B65.09%20Zn%7D)
You have to divide the given by the molar mass then multiply by the mol ratio which in this case is 1:1