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3 years ago

How many grams are there in 9.40 x 10^25 molecules of H2? with prove so i could understand how you got it. if you can thank you

1 answer:

5 0

Convert amount of molecules into moles using Avogadro’s number

9.40 x 10^25 molecules H2 x 1 mole / 6.02 x 10^23 molecules

= 156 moles H2

Convert moles of H2 into grams using H2’s molar mass (1.01 x 2 = 2.02)

156 mol H2 x 2.02 g / 1 mol
= 315 g H2

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For the reaction at 298 K, 2NO2(g) N2O4(g) the values of ΔH° and ΔS° are -58.03 kJ and -176.6 J/K, respectively. Calculate the v

Ierofanga [76]

Answer:

$\Delta G^o=-5.4032 kJ$

The temperature for $\Delta G^o=0[/tex is [tex]T=328.6 K$

Explanation:

The three thermodinamic properties (enthalpy, entropy and Gibbs's energy) are linked in the following formula:

$\Delta G^o=\Delta H^o + T*\Delta S^o$

Where:

$\Delta G^o$ is Gibbs's energy in kJ

$\Delta H^o$ is the enthalpy in kJ

$\Delta S^o$ is the entropy in kJ/K

$T$ is the temperature in K

Solving:

$\Delta G^o=-58.03 kJ - 298K*-0.1766 kJ/K$

$\Delta G^o=-5.4032 kJ$

For $\Delta G^o=0$ :

$0=\Delta H^o - T*\Delta S^o$

$\Delta H^o= T*\Delta S^o$

$T=\frac{\Delta H^o}{\Delta S^o}$

$T=\frac{-58.03 kJ}{-0.1766 kJ/K}$

$T=328.6 K$

3 0

3 years ago

Read 2 more answers

how many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?

vova2212 [387]

The formula of citric acid is:

   CO2H
   |
HO - C - CH2CO2H
   |
C - CH2 CO2H

I bolded the 4 hydrogens that can be subsituted by sodium.

Three of those hydrogens belong to carboxyl group (- CO2H) and one to a hydroxyl group (- OH).

You need to take into account that 4 H will form 2 H2 molecules.

So, the answer is that 2 moles of molecules will be formed from 1 mole of citric acid molecules.

4 0

3 years ago

Is the following reaction spontaneous at 298 K? (Answer by calculating delta G)

patriot [66]

Answer:

The reaction H2O(g)+C(s) -> CO(g)+ H2(g) is NOT spontaneous because its ΔG = 91 kJ/moles

Explanation:

ΔG is calculated by ΔH - TΔS

ΔG = ΔH - TΔS

ΔG = 131.3 kJ/mole - 298K . 0,134kJ/mole K

ΔG = 91.068 kJ/moles

Be careful with the ΔS, because you have J, and in ΔH, you have kJ

6 0

3 years ago

What has more<br> mass, a mole of<br> sodium chloride<br> or 2 moles of<br> aluminum?

eimsori [14]

Answer:

2 moles of aluminum

Explanation:

5 0

3 years ago

Which describes the relationship between [H+] and [OH−] ?

jarptica [38.1K]

For a neutral solution,
[H+][OH-] = 1 x 10⁻¹⁴

7 0

4 years ago