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GarryVolchara [31]
3 years ago
13

What's makes up chromatin

Chemistry
1 answer:
tankabanditka [31]3 years ago
8 0

Answer:

histones

Explanation:

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The standard molar enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the enthalpy change if 9.51 g N2(g) and 1.96 g H2(g)
Vladimir [108]

Answer:

\Delta H=-29.7kJ

Explanation:

Hello!

In this case, since the undergoing chemical reaction is:

N_2+3H_2\rightarrow 2NH_3

We first need to identify the limiting reactant given the masses of nitrogen and hydrogen:

n_{NH_3}^{by\ H_2}=1.96gH_2*\frac{1molH_2}{2.02gH_2}*\frac{2molNH_3}{3molH_2}=0.647molNH_3\\\\  n_{NH_3}^{by\ N_2}=9.51gN_2*\frac{1molN_2}{28.02gN_2}*\frac{2molNH_3}{1molN_2}=0.679molNH_3

It means that only 0.647 moles of ammonia are yielded, so the resulting enthalpy change is:

\Delta H=0.647molNH_3*\frac{-45.9kJ}{1molNH_3}\\\\ \Delta H=-29.7kJ

Best regards!

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Describe what is the number on the bottom of each element symbol on the periodic table telling you.
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When are drops of indicator most likely added to the Erlenmeyer flask?
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\sf \: A  \: tremor \:  is \:  a \:  rhythmic \:  shaking\: movement \:  in  \: one \\ \sf  or  \: more \:  parts \:  of \:  your \:  body.  \\ \sf It \:  is  \: involuntary,  \: meaning  \: that \:  you \:  cannot  \\ \sf control\: it.  \: This \:  shaking  \: happens  \\ \sf because \:  of \:  muscle  \: contractions.  \\\sf A \:  tremor  \: is \:  most  \: often  \: in \:  your  \: hands, \\ \sf  but \:  it  \: could \:  also  \: affect \: your \:  arms, \\ \sf  head,  \: vocal cords,  \: trunk,  \: and \:  legs.

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