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Ainat [17]
3 years ago
11

Need help with the 1st one

Chemistry
1 answer:
lutik1710 [3]3 years ago
7 0

If I’m right this should be the answer

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2. STEM The mass of an atom of helium is about 4.002 atomic units.
Anit [1.1K]

Answer:

The approximate mass of beryllium is 9.0045 u.

Explanation:

Given data:

mass of helium= 4.002 u

mass of beryllium which is 2.25 times of mass of helium= ?

Solution:

we will multiply the mass of helium with 2.25 times,

4.002 u × 2.25 = 9.0045 u

so the mass of beryllium atom would be 9.0045 u.

6 0
3 years ago
How many grams of NA required to react with 75.0 gramsof CL2?
noname [10]
Cl2 has a molar mass of 71g/mole.
75g/71g/mole=1.06moles of cl2
2Na+Cl2→2NaCl
therefore, for every one mole of cl2 there are 2 moles of Na.
1.06*2=2.12moles of Na
every mole of Na is 22.98g
2.12moles *22.98g/mole= 48.72g Na

answer is 42.72grams
7 0
3 years ago
Which describes a homogeneous mixture?
Rom4ik [11]

Answer:

A solution dissolves in a solute to make a solvent.

Explanation:

The image is from Google

6 0
3 years ago
(Science)
kramer
The permian period because right after that are the triassic, jurassic, and cretaceous periods, which are known for the dinosaurs . hope this helps!!
7 0
3 years ago
Read 2 more answers
An object is made from a material that is hard, shiny, and can be hammered into thin sheets.
monitta

Answer:

3) it is a good conductor heat.

Explanation:

An object is made from a material that is hard, shiny, and can be hammered into thin sheets. The aforementioned properties are those of a metal. Therefore, the other property of a metal is that, it is a good conductor of heat and even electricity because there valence (outer) electrons are delocalized. Some examples of chemical elements that are metals are iron, gold, sodium, silver, copper etc.

6 0
3 years ago
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