Answer:
The internal energy(ΔE) of a substance is calculated below:
From the first law of thermodynamics;
ΔE=q+w
Explanation:
<u>ΔE=q+w</u>
here;
+q=endothermic reaction
-q=exothermic reaction
+w=work done on the system
-w=work done by the system
Given:
q=+1.62kJ=1620J
w=-874J
To solve:
the internal energy(ΔE)
We know:
ΔE=q+w
<em>according to the problem;</em>
ΔE=q-w
since;
w=-874J (i.e.)work is done by the system.
ΔE=1620-874
ΔE=+746J
Therefore the internal energy is +746J
i.e. the option is "c"(+746J)
Answer:
volume=0.4ml
Explanation:
use the equation
n=c×v. first make v become the subject of the formula by dividing c on both sides of the equation
v=n/c
v=0.100÷2.5×10^-2
v=4×10^-4
v=0.0004L
now convert 0.0004L to ml by multiplying 0.0004 with 1000 to get 0.4ml
therefore the volume in ml is 0.4ml
Answer:
Answer the last one Nuclear decay rates vary, but chemical reaction rates are constant
Explanation:
Correct me if im wrong