Answer: weigh is m = n × M = 2.87 mol × 58.44 g/mol
Explanation: mass = amount of substance × molar mass
M((NaCl) = 22.99 +35.45
The answer is B since it's a second order reaction.
Answer:
To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C9H8O4. It is convenient to consider 1 mol of C9H8O4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements:
%
C
9
mol C
×
molar mass C
molar mass
C
9
H
18
O
4
×
100
=
9
×
12.01
g/mol
180.159
g/mol
×
100
=
108.09
g/mol
180.159
g/mol
×
100
%
C
60.00
%
C
To find the balanced reaction, you have to predict the products and write the equation first.
This will be a single replacement reaction because aluminum is an element and copper nitrate is a compound.
The reaction will be:
Al + Cu(NO3)2 -> Cu + Al(NO3)3
Now, we can balance it:
2 Al + 3 Cu(NO3)2 -> 3 Cu + 2 Al(NO3)3
