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il63 [147K]
3 years ago
15

Alkaline earth metals are very reactive because of how many valence electrons ?

Chemistry
1 answer:
Alborosie3 years ago
8 0
Their is 2 valence electrons
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If the atomic mass of 1 oxygen atom is 15.9994 amu, how much mass does of 1 mole oxygen have?​
IrinaK [193]

Answer:

15.9994 amu

Explanation:

By definition 1 mole of any substance is the mass that contains 1 Avogadro's Number of particle. (=> 6.02 x 10²³ particles/mole).

1 mole Oxy => 15.9994 amu => contains 6.02 x 10²³ particles Oxy /mole

1 mole Sulfur => 32.064 amu => contains 6.02 x 10²³ particles Sulfur /mole

1 mole H₂O => 18 amu => contains 6.02 x 10²³ molecules of water / mole.

6 0
3 years ago
a sample of tetrachloroethylene, a liquid used in dry cleaning that is being phased out because of its potential to cause cancer
Darina [25.2K]

The density of the liquid at the given temperature is 1.622 g/mL

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to determine the density </h3>

The density of the liquid can be obtained as illustrated below:

  • Mass of liquid = 40.55 g
  • Volume of liquid = 25 mL
  • Density of liquid =?

Density = mass / volume

Density = 40.55 / 25

Density of liquid = 1.622 g/mL

Learn more about density:

brainly.com/question/952755

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4 0
2 years ago
Please help me find the correct answer, thank you.
alex41 [277]

Answer:

The third line

Explanation:

The first one us wrong because they're not all found inside,electron is outside.

The second one is wrong as I explained previously.

Lastly the fourth line is wrong because protons are found in the nucleus.

4 0
3 years ago
How many miles of N2 are in a flask with a volume of 250.0 mL at a pressure of 300.0 kPa and a temperature of 300.0 K?
Maslowich
As hot as my cooter lips



hope this helped :)
8 0
3 years ago
7 points
Free_Kalibri [48]

Answer: 12 ( answer not among the option)

Explanation:

From the equation of reaction; P4O10+ H2O     ----->    H3PO4, it is unbalanced.

One can only get the exact number of ''Hydrogen atom'' if it is well balanced.

Adding '4' to H3PO4 on the RHS and '6' to H2O on LHS of the equation would give a balanced equation such as;

P4O10 + 6H2O     ----->   4 H3PO4

Therefore the number of hydrogen atoms found on the reactant is 12.

6 0
3 years ago
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