Answer: 724.71 grams
Explanation:
Volume of solution (v) = 5.1 liters
Concentration of solution (c) = 1.4M
Amount of CuF2 needed (n) = ?
Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence
c = n / v
make n the subject formula
n = c x v
n = 1.4M x 5.1 Liters
n = 7.14 moles
Since, 7.14 moles of CuF2 (n) is needed, use the molar mass of CuF2 to get the mass in grams.
The atomic masses of Copper = 63.5g;
and Fluorine = 19g
So, I CuF2 = 63.5g + (19g x 2)
= 63.5g + 38g
= 101.5g/mol
Then, apply the formula
Number of moles = mass in grams / molar mass
7.14 moles = m / 101.5 g/mol
m = 7.14 moles x 101.5 g/mol
m = 724.71g
Thus, 724.71 grams of copper (II) fluoride, CuF2, are needed to make 5.1 liters of a 1.4M solution
the answer is a- gas and plasma. i took it on usa test prep.
For the reaction, the equilibrium constant equation will be:
Kc = [NO₂]² / [N₂O₄]
Kc = (0.5)² / 0.025
Kc = 10
The answer is C.
Answer:
a. Negative
b. Positive
c. Negative
d. zero
Explanation:
Entropy is measure of disorder. Positive entropy implies that a system is becoming more disordered. The opposite is true.
(a) N2(g)+3H2(g) → 2NH3(g) Negative because the system is becoming less disordered since the number of gaseous moles is decreasing
(b) CaCO3(s)→CaO(s)+CO2(g) Positive because a solid produces a gas which is more disorder therefore there is an increase in entropy
(c) 3C2H2(g)→C6H6(g) Negative because the number of moles of a gas decrease meaninng there is less disorder
(d) Al2O3(s)+3H2(g) → 2Al(s)+3H2O(g) zero because the gaseous moles do not change
Answer:
CH4 + 2O2 → CO2 + 2H2O
Explanation:
1. Add 2 before H20 to get equal amount of hydrogen on both sides of equation.
2. Add 2 before 02 to get equal amount of oxygen on both sides of equation.
