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Luda [366]
3 years ago
11

Can someone please help me with these questions

Chemistry
1 answer:
skelet666 [1.2K]3 years ago
3 0

Answer:

1. 40 grams

2. 20 grams

Explanation:

every 10 years, divide by 2

year 0; 80

year 10; 40

year 0; 80

year 10; 40

year 20; 20

please give thanks by clicking heart button! :)

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Select the correct answer. _____enable long-term resistance to infections that have been present in the body before. A. Monocyte
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Answer:

C. Lymphocytes

Explanation:

All of the following choices are kinds of white blood cells that have a significant role in the body's immune system.

A. Monocytes

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5 0
3 years ago
During the Big Bang, what were the two main chemical elements created?
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How many grarns would 3 moles of carbon dioxide (CO2) weigh? (round to the
BigorU [14]

Mass of CO₂ = 132 g

<h3>Further explanation   </h3>

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mole also can be formulated :

\tt n=\dfrac{mass}{MW}

moles of CO₂ = 3

mass of CO₂(MW=44.01 g/mol) :

\tt mass=mol\times MW\\\\mass=3\times 44.01\\\\mass=132.03~g\approx 132~g

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