<u>Answer 45 :</u> This statement is true.
Explanation :
We are taking an example of carbon (C) with atomic number 6 and atomic mass 12.
As we know that the number of protons and number of electrons are equal to the atomic number.
The atomic number of carbon is 6. So, the number of protons and the number of electrons is equal to 6.
And, the number of neutrons = Atomic mass - Atomic number = 12 - 6 = 6
Hence, this statement is true.
<u>Answer 46 :</u> This statement is true.
Explanation :
We are taking an example of oxygen (O) with atomic number 8.
The electronic configuration of oxygen (O) will be,
Now we have to calculate the number of electrons from the electronic configuration.
The number of electrons = 2 + 2 + 4 = 8
Hence, this statement is true.
A) 0.875 M of MgBr2 is 0.875 mol/L
B) 23.7 mL = 0.0237 L
0.875 mol => 1 L
x mol => 0.0237 L
Cross multiply
1x = 0.875 × 0.0237
x = 0.0207 mol
>> In 23.7 mL of 0.875 M MgBr2 solution there is 0.0207 moles of MgBr2
C) Molar mass of MgBr2 (*) = 24.305 + (2 × 79.904) = 184.113 g/mol
184.113 g => 1 mol
x g => 0.0207 mol
Cross multiply
1x = 184.113 × 0.0207
x = 3.8111 g
>> 0.0207 moles of MgBr2 is equivalent to 3.81 g of MgBr2
>> In 23.7 mL of 0.875 M MgBr2 solution there is 3.81 g of MgBr2
(*) Use your periodic table
Photosynthesis is the process in which a plant absorbs minerals, water, carbon dioxide and of course sunlight. It then converts all of this into starch, which is its energy, and its main by-product oxygen, which it releases into the air.
Answer:
that's a good question but I'm not too sure