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3 years ago

Help plz:)))I’ll mark u Brainliest

Chemistry

2 answers:

4vir4ik [10]3 years ago

7 0

Matter is anything that has mass and occupies space, It can exist in 3 states, or phases: solid, liquid, and gas.

Solid molecules are closely packed together and retain a fixed shape.

Liquid molecules aren't packed very closely, and take the shape of the bottom of the container.

Gas molecules are far apart and fill the container

completely.

fredd [130]3 years ago

5 0

Answer:

1. So-lid

2.So-lid

3. Gas

4. Gas

5. Liquid

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1. How many grams of NaOH are in 400.0 mL of a 0.5 M solution of NaOH?

Anit [1.1K]

1. molarity = (moles)/vol in litres
0.5=[(weight/40)*1000]/4
0.5 = weight/16
weight of NaOH = 8 grams

2. weight = 0.45*850*84/100 gms
molecular weight = 85m (not sure abt this)

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3 years ago

Fossil fuels are what resource

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Answer:

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Explanation:

fossil fuels are continually formed by natural processes, they are generally classified as non-renewable resources because they take millions of years to form, and known viable reserves are being depleted much faster than new ones are generated.

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3 years ago

Calculate the pressure in atmospheres exerted by 10.0 moles of hydrogen gas at 293 Kelvin if it is stored in a 7.50 liter contai

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3 years ago

In a 45 minute road trip a vehicle emitted 16. 7 g of nitrogen dioxide (NO2) from its exhaust. What is the mass of nitrogen atom

shepuryov [24]

When a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust then the mass of nitrogen atoms in this amount of NO₂ would be 5.082 grams.

<h3>What is a Chemical compound?</h3>

The chemical compound is a combination of two or more either similar or dissimilar chemical elements.

for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom

The molecular mass of any compound is calculated by the sum of the mass of the individual atom

As given in the problem In a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust

The molecular mass of the NO₂ is the sum of the mass of the nitrogen atom and the oxygen atom.

The mass of the single nitrogen atom is 14, while the mass of the single oxygen atom is 16

the molecular mass of NO₂= mass of the N atom+2×(mass of O atom)

= 14 + 2×16

=46

As 46 grams of NO₂ contain 14 grams of Nitrogen

then 1 gram of NO₂ would contain 14/46 grams of Nitrogen

then 16.7 grams of NO₂ would contain (14/46×16.7) grams of Nitrogen

The mass of a nitrogen atom in 16.7 grams of NO₂ would be 5.082 grams

Learn more about a chemical compound

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2 years ago

Why does carbon form so many organic compounds?

11111nata11111 [884]

Because each carbon atom can form for chemical bonds to another’s atoms and because the carbon atom is just the right small size to fit in comfortably as parts of very large molecules

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