<span>-5230 J
Given the above data, the piece of metal raised the temperature of 250.0 grams of water from 20.0°C to 25.0°C. So there was a change of 5.0°C
The specific heat of water is 4.184 joules per gram which is the amount of energy needed to rais</span>
Answer:
C2= 0.16M
Explanation:
C1= 2M, V1= 20ml, C2= ?, V2= 250ml
Applying dilution formula
C1V1= C2V2
2×20 =C2×250
C2= 0.16M
Number of moles = mass / molar mass
number of moles of H2 = (<span>6.96×10−4) / (2)(1) = 3.48*10^-4 moles
</span>The equation that describes the formulation of NH3 is:
N2 + 3H2 .......> 2NH3
From the balanced chemical equation, we can see that:
3 moles of H2 produces 2 moles of NH3
Based on this, to know the number of moles of NH3 produced from 3.48*10^-4 moles of hydrogen, we will do cross multiplication as follows:
number of moles = (3.48*10^-4*2) / (3) = 2.32*10^-4 moles
Now, one mole of any element contains Avogadro's number of molecules. Therefore, number of molecules in 2.32*10^-4 moles can be calculated as follows:
number of molecules = 2.32 * 10^-4 * 6.022 * 10^23 = 1.397 * 10^20 molecules
Answer: Element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron
Explanation:a b d
Answer:
ΔH > O and ΔH > TΔS
Explanation:
When a reaction is non-spontaneous even though the standard entropy change of the reaction is large and positive the reason is the reaction is highly endothermic and dominates the term TΔS in the standard Gibbs free energy expression:
ΔG = ΔH-TΔS
Remember that for an endothermic reaction to be spontaneous ΔG < 0 and this can occur only if the term TΔS is greater than ΔH. This is not the case for quartz which requires a good quantity of energy to overcome its crystaline 3D lattice in which the oxygen are shared between 2 silicon atoms.