Answer: the plum pudding model
Explanation:
for A P E X i just took the test
Reactants are what is changed in the chemical reaction. They go before the arrow when you wrote the equation. Products are what is formed when the chemical reaction occurs. Products always contain the same elements as the reactants, but they might be rearranged because of the reaction. In this picture, you can see that the reactants go before the arrow, and the products go after.
Answer:
0.047 M
Explanation:
Given data:
Volume of KF = 93.2 mL
Molarity of KF = 2.03 M
volume of water added= 3.92 L
Solution:
First of all we will calculate the number of moles of KF.
number of moles = Molarity × volume in litter
number of moles = 2.03 mol/L × 0.0932 L
number of moles = 0.189 mol
Molarity of solution:
Total volume = 3.92 L + 0.0932 L = 4.0132 L
Molarity = number of moles / volume in litter
Molarity = 0.189 mol/ 4.0132 L
Molarity = 0.047 M
Answer:
0.940mol &
0.000301mol respectively.
Explanation:
number of moles = given mass / molar mass
given mass of Nacl = 55g Molar mass = 23 + 35.5
n=m/M = 55g/58.5g/mol = 0.940mol
note- (add the atomic weights of sodium and chlorine to get the molar mass of Nacl.) = 58.5g/mol
similarly, NaCO3 = 23 + 12 + 16*3 = 83g/mol
n=m/M = 0.025g/83g/mol = 3.01 * 10^-4 = 0.000301mol
extra: If you ever get asked to put it in number of particles just use the relation of 1mole = 6.02 * 10^23 particles.
The answer to this question is 2 and 3
