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statuscvo [17]
3 years ago
12

What is the difference between mass number and the average atomic number mass of beryllium?

Chemistry
1 answer:
Vlad [161]3 years ago
7 0

Answer:

eycggegvv gvchgveh

Explanation:

nrjnkvnrntkn

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alexgriva [62]
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3 0
3 years ago
How many molecules of O2 are in 153.9 g O2?
MrRissso [65]

Answer:

2.895*10^24

Explanation:

mass of Oxygen give = 153.9g

molar mass of O2 molecule = 16*2=32g/mol

n= mole

To find the mole

n= mass/ molar mass

n= 153.9/32

n=4.81mol.

To find the number of molecules of o

Nm= number of molecule

Nn = Number of mole

NA = number of Avogados

Nm= Nn * NA

Nm= 4.81 *6.02*10^23

Nm= 2.895*10^24

3 0
3 years ago
Which of the following are signs of a chemical change/reaction? Select all that apply.
Ymorist [56]

Answer:

the answers are

Explanation:

5,6,7,8&9.

3 0
4 years ago
Draw the Lewis structure for NO2-. How many single bonds, double bonds, triple bonds, and unshared pairs of electrons are on the
Aloiza [94]
Nitrogen has one single bond, one double bond, no triple bonds, one unshared pair of electrons.

5 0
3 years ago
In terms of attractive forces, explain why LiClhas a higher melting point than SCI2.​
iren [92.7K]

Answer:

Well, SCl2 is known, so is disulfur dichloride… Cl−S−S−Cl …and BOTH these species are molecular… On the other hand, lithium chloride, an ionic salt, is decidedly non-molecular, and consists of an infinite array of lithium and chloride ions held together by strong electrostatic forces ….. and thus we would expect the salt to have the much higher melting point….

5 0
3 years ago
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