The typical formation reaction is the synthesis of 1 mole of a substance from its elements in their a lot of stables forms under typical conditions. The well balanced chemical equation is:
Na(s) + C(s, graphite) + 1/2 H₂(g) + 3/2 O₂(g) → NaHCO₃(s)
What mass of HF should react to develop 345 kJ of energy? Assume excess Sio2 sio2(s) + 4 HF(g) ? SiF4(g) + 2H20(,) 4Hxn--184 kJ
steustatiushistory.org: The mass of HF reacted is 150 g.
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We are given:
Amount of energy released = -345 kJ
For the provided chemical reaction:
By Stoichiomeattempt of the reaction:
184 kJ of power is released once 4 moles of hydrofluoric gas is reacted.
So, 345 kJ kJ of energy will certainly be released as soon as =
Now, to calculate the mass of HF, we use the equation:
Molar mass of HF = 20 g/mol
Moles of HF = 7.5 moles
Putting worths in above equation, we get:
Hence, the mass of HF reacted is 150 g.
5 months ago
How long will it take for a 750 mg sample of radium with a half life of 15 days to degeneration to precisely 68mg?
Whenever a question asks you, "How lengthy to reach a specific concentration?" or somepoint comparable, you need to usage the appropriate incorporated price legislation expression.
The integrated price regulation for a first-order reactivity is
t_ ½ = 15 da
Tip 1. Calculate the value of the rate consistent.
t_½ = ln2/k Multiply each side by k
kt_½ = ln2 Divide each side by t_½
k = ln2/t_½
= 0.0462 da⁻¹
Step 2. Calculate the time
ln(750/68) = 0.0462t
ln11.0 = 0.0462t
2.40 = 0.0462t Divide each side by 0.0462
t = 52 da
9 months ago
Complexes containing metals through d10 electron configurations are frequently colorless because:
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A. (i think)
9 months ago
25cm3 of gas at 1 atm has actually a temperature of 20 level celsis .
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To solve this difficulty, you should use the gas legislations, more particularly the Incorporated Gas Law. It is P1V1/T1 = P2V2/T2. Ssuggest plug your worths in. But be careful! Make certain you transform your 20 level C and also 28 deg C to Kelvin, as that it the just temperature range the Gas Laws work with. Upon plugging in your worths, you gain around 1.28 atm.
4 months ago
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