Answer:
Density of block of gold is <em>3.5 g/cm³.</em>
Explanation:
Given data:
Volume of block = 1000 mL
Mass of block = 3.5 kg (3.5×1000 = 3500 g)
Density of block = ?
Solution:
Density of substance is calculated by dividing the mass of substance over its volume.
Formula:
d = m/v
d = 3500 g/ 1000 mL
d = 3.5 g/mL
or
d = 3.5 g/cm³ (1ml = 1cm³)
Answer:
The correct option is: ΔSsurr is greater than 0 and its magnitude is greater than ΔSsys.
Explanation:
For a <u>chemical reaction to be spontaneous, the change in the</u> <u>Gibbs free energy should be negative (ΔG = -ve).</u>
At constant temperature (T) and pressure, the Gibbs free energy is given by the equation:
Here, is the enthalpy change and is the entropy change of the system.
Also, <u>according to the second law of thermodynamics</u>, <u>for a spontaneous process, the total entropy</u>,
Therefore, <u>for a reaction to be spontaneous</u>, if is less than 0 or negative; then <u> should be greater than 0 or positive. </u>Also, > .
Answer:
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Answer:
1.13×10^25 molecules of water.
Explanation:
Equation of the reaction;
C8H18(g) + 25/2 O2 (g) -------> 8CO2(g) + 9H2O(l)
It is important to first put down the balanced reaction equation. It is not possible to solve any problem on stoichiometric relationship without a balanced reaction equation. Once the equation is obtained, we can now proceed with other steps in the solution of the problem.
From the reaction equation, 1 mole of C8H18 produces 9 moles of water
1 mole of C8H18 occupies 22.4L volume while 1 mole of water contains 6.02×10^23 molecules of water
Hence
22.4 L of C8H18 produces 9(6.02×10^23) molecules of water
46.72 L of C8H18 will produce 46.72 L × 9(6.02×10^23) molecules of water/22.4 L
= 113×10^23 or 1.13×10^25 molecules of water.
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