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3 years ago

What STARTING element undergoes alpha decay to yield uranium-234 (U) as a PRODUCT?

Chemistry

1 answer:

nadezda [96]3 years ago

3 0

Uranium-238 is the element that undergoes decay to yield uranium-234

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Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2H2S(g) 3O2(g)2H2O(l) 2SO2

Marizza181 [45]

Answer:

$\Delta _rH=-1124.14kJ/mol$

Explanation:

Hello!

In this case, since the standard enthalpy change for a chemical reaction is stood for the enthalpy of reaction, for the given reaction:

$2H_2S(g) +3O_2(g)\rightarrow 2H_2O(l) +2SO_2(g)$

We set up the enthalpy of reaction considering the enthalpy of formation of each species in the reaction at the specified phase and the stoichiometric coefficient:

$\Delta _rH=2\Delta _fH_{H_2O,liq}+2\Delta _fH_{SO_2,gas}-2\Delta _fH_{H_2S,gas}-3\Delta _fH_{O_2,gas}$

In such a way, by using the NIST database, we find that:

$\Delta _fH_{H_2O, liq}=-285.83kJ/mol\\\\\Delta _fH_{SO_2, gas}=-296.84kJ/mol\\\\\Delta _fH_{O_2,gas}=0kJ/mol\\\\\Delta _fH_{H_2S,gas}=-20.50kJ/mol$

Thus, we plug in the enthalpies of formation to obtain:

$\Delta _rH=2(-285.73kJ/mol)+2(-296.84kJ/mol)-2(-20.50kJ/mol)-3(0kJ/mol)\\\\\Delta _rH=-1124.14kJ/mol$

Best regards!

8 0

3 years ago

Calculate the amount in grams of Na2CO3 needed in a reaction with HCl to produce 120g NaCl?

klemol [59]

The balanced chemical reaction is written as :

Na2CO3<span> + 2HCl === 2NaCl + H2O + CO2
</span>
We are given the amount of NaCl to be produced from the reaction. This will be the starting point for the calculations. We do as follows:

120 g NaCl ( 1 mol / 58.44 g) ( 1 mol Na2CO3 / 2 mol NaCl)( 105.99 g / 1 mol ) = 1108.82 g Na2CO3 needed

8 0

3 years ago

Explain in a short sentence how you can tell a reaction is a decomposition reaction.

mr Goodwill [35]

Answer: A decomposition reaction occurs when one reactant breaks down into two or more products.

Mark me as brainilist pls

3 0

2 years ago

A substance registers a temperature change from 20°c to 40°c. to what incremental temperature change does this correspond?

Alik [6]

If u are multiplaying it would be 80 percent more likely
or if u are subtracting it would be 20 percent

4 0

3 years ago

Under which conditions are gases most soluble in water?

Volgvan

Hi,

Gases are most soluble in water under high pressure and low pressure.

6 0

3 years ago