ANSWER
The number of protons in an atom of N-15 is 7
<u>STEP-BY-STEP EXPLANATION:</u>
Firstly, we need to define an isotope
Isotopes are two or more atoms that have the same atomic number and position in the periodic table but different mass numbers due to differences in the number of neutrons.
Recall that, atomic number = no of proton
Since the isotopes of nitrogen are N-14 and N-15
The atomic number of nitrogen is 7 according to its position in the periodic table
Hence, the number of protons in an atom of N-15 is 7
Answer:
9 times
Explanation:
A + 2B → products
rate = k[A][B]2
While holding the concentration of A constant, the concentration of B is tripled. Predict by what factor the rate of reaction increases.
We can achieve this by given the concentration dummy values.
Assuming the following values (Any number works, or letters);
concentration of A = 1
Concentration of B = 2
rate = k[A][B]2
rate = k (1)* (2)^2
rate = k 4 ....... i
When Conc of B is tripled;
Concentration of B = 3 * 2 = 6
rate = k[A][B]2
rate = k (1) * (6)^2
rate = k 36 .... ii
Comparing both rates;
The ratio is 36: 4, upon simplifying = 9 : 1
This means the factor increases by 9 times
Molar mass MgCO3 => 84.31 g/mol
1 mole MgCO3 ----------- 84.31 g
1.5 moles MgCO3-------- ??
1.5 x 84.31 / 1 => 126.465 g
Given : Density of Bromine = 3.12 g/mL
Formula : Density = Mass / Volume
Part A :
Given Volume = 125 mL
Density = Mass / Volume
So, Mass = Density x Volume
= 3.12 x 125
= 390 grams
Part B :
Given mass = 85.0 gm
Density = Mass / Volume
So, Volume = Mass / Density
= 85 / 3.12
= 27.24 mL
