Contain genetic material from both mother and father ;) hoped this helps !
Basic Information
Name:<span> Lanthanum </span>
Symbol:<span> La </span>
Atomic Number:<span> 57 </span>
Atomic Mass:<span> 138.9055 amu </span>
Melting Point:<span> 920.0 °C (1193.15 K, 1688.0 °F) </span>
Boiling Point:<span> 3469.0 °C (3742.15 K, 6276.2 °F) </span>
Number of Protons/Electrons:<span> 57 </span>
Number of Neutrons:<span> 82 </span>
Classification: Rare Earth
Crystal Structure:<span> Hexagonal </span>
Density @ 293 K:<span> 6.7 g/cm</span>3
Color:<span> white
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I think the best answer from the choices listed above is option 1. <span>Two substances in a mixture differ in density and particle size. These properties can be used to separate the substances. These properties can be manipulated in order to have a better separation between the two substances.</span>
Answer:
4.99*10²³ molecules of N₂O₄ are in 76.3 g of N₂O₄
Explanation:
Avogadro's Number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.
You know that the molar mass of N₂O₄ is 92.02 g/mol, and you have 76.3 g. Then you can apply the following rule of three: 92.02 grams are present in 1 mole of the compound, 76.3 grams in how many moles are they?

amount of moles= 0.83 moles
Then, you can apply another rule of three: if by definition of Avogadro's number 1 mole of the compound has 6.023*10²³ molecules, 0.83 moles of the compound, how many molecules will it have?

amount of molecules= 4.99*10²³
<u><em>4.99*10²³ molecules of N₂O₄ are in 76.3 g of N₂O₄</em></u>