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3 years ago

Please help :( this is for science.

Chemistry

1 answer:

elena55 [62]3 years ago

4 0

Solar eclipse only i believe

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Suppose that the root-mean-square velocity vrms of water molecules (molecular mass is equal to 18.0 g/mol) in a flame is found t

Zolol [24]

Answer:

$T=954.41\ K$

Explanation:

The expression for the root mean square speed is:

$C_{rms}=\sqrt {\dfrac {3RT}{M}}$

R is Gas constant having value = 8.314 J / K mol

M is the molar mass of gas

Molar mass of water vapor = 18.0 g/mol = 0.018 kg/mol

Temperature = ?

$C_{rms}=1150$ m/s

$1150=\sqrt{\frac{3\times 8.314\times T}{0.018}}$

$1322500=\frac{24.942T}{0.018}$

$T=954.41\ K$

4 0

3 years ago

When 1.04g of cyclopropane was burnt in excess oxygen in a bomb calorimeter, the temperature rose by 3.69K. The total heat capac

STatiana [176]

Answer:

$\Delta _{comb}H=-2,093\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since these calorimetry problems are characterized by the fact that the calorimeter absorbs the heat released by the combustion of the substance, we can write:

$Q_{rxn}+Q_{cal}=0$

Thus, given the temperature change and the total heat capacity, we obtain the following total heat of reaction:

$Q_{rxn}=-14.01kJ/K*3.69K\\\\Q_{rxn}=-51.70kJ$

Now, by dividing by the moles in 1.04 g of cyclopropane (42.09 g/mol) we obtain the enthalpy of combustion of this fuel:

$n=\frac{1.04g}{42.09g/mol}=0.0247mol\\\\\Delta _{comb}H=\frac{Q_{rxn}}{n}\\\\ \Delta _{comb}H=-2,093\frac{kJ}{mol}$

Best regards!

4 0

3 years ago

Which of the following molecules is polar?

Colt1911 [192]

Answer:

CH3F

Explanation:

because if drawn out its is asymmetric

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What element has an atomic number of 53

Novay_Z [31]

Iodine (I) Plz mark brainliest. HOPE THIS HELPS!

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3 years ago

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In the reaction between bromine and sodium, a bromine atom gains an electron and forms the bromide ion, Br-. What happens to bro

AlekseyPX

It becomes ionized and attains its stable electronic configuration.

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3 years ago