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4 years ago

Whats the length of an aluminum rod at 65 c if its length at 15 c is 1.2 meters

Chemistry

1 answer:

Furkat [3]4 years ago

4 0

15c - 1.2m
1c - 1.2/15 = 0.08m
65c - 5.2m

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Alex787 [66]

C metamorphic rock
Why: because o know

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3 years ago

In the reaction 2 H, Ł02 → 2 H, O, what is the mole ratio of hydrogen to water?

Bogdan [553]

because both have 2's in front of them

6 0

3 years ago

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorim

Serggg [28]

Answer:

$\Delta E_{rxn}$ for combustion of naphthalene is -5164 kJ/mol

Explanation:

$\Delta E_{rxn}=C_{calorimeter}\times \Delta T_{calorimeter}$

where, C refers heat capacity and $\Delta T$ refers change in temperature.

Here, $\Delta T_{calorimeter}=(32.33-24.25)^{0}\textrm{C}=8.08^{0}\textrm{C}$

So, $\Delta E_{rxn}=(5.11\frac{kJ}{^{0}\textrm{C}})\times (8.08^{0}\textrm{C})=41.3kJ$

$\Delta E_{rxn}$ is generally expressed in terms of per mole unit of reactant. Also, $\Delta E_{rxn}$ should be negative as it is an exothermic reaction (temperature increases).

Molar mass of naphthalene is 128.17 g/mol

So, 1.025 g of naphthalene = $\frac{1.025}{128.17}moles$ of naphthalene

= 0.007997 moles of naphthalene

$\Delta E_{rxn}=-\frac{41.3kJ}{0.007997mol}=-5164kJ/mol$

5 0

3 years ago

If ammonia is manufactured at 356 k, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction ar

Alchen [17]

The reaction will be spontaneous if Gibb free energy is negative, according the following relation:
G = H - T*S
where G is Gibbs free energy, T is change of enthalpy , T is temperature and S is change of entropy
In the case of ammonia:
G = -93000 - 356*(-198) = -93000 + 70488 = -22512 j/mol
As G < 0 then the reaction is spontaneous.

5 0

4 years ago

Draw a Lewis structure and indicate the hybridization for each molecule that contains more than one interior atom. Draw the Lewi

alexdok [17]

Answer:

See figure 1

Explanation:

In this question, we have to remember that each carbon has 4 electrons and each hydrogen has 1 electron. Additionally, the structure proposed have to have 8 electrons for each atom (except hydrogen). With this in mind, we need to have a double bond between the carbons, because in this arrangement each carbon would have 8 electrons (octet rule).

See figure 1

I hope it helps!

6 0

3 years ago