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8090 [49]
3 years ago
15

Nitrogen gas reacts with hydrogen gas to form nitrogen trihydride?

Chemistry
1 answer:
oksano4ka [1.4K]3 years ago
8 0
It is based on something better called ammonia
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The half life of an isotope X is 3 days how long will it take for 1/2 of a 10 G sample to decay
lorasvet [3.4K]

Answer:  It will take 3 days for half of a 10 g sample to decay.

Explanation:

Half-life of sample of an isotope X = 3 days

\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{3 days}=0.231 day^{-1}

N=N_o\times e^{-\lambda t}

\lnN=-\lambda t\lnN_o

Sample decayed = \frac{N_o}{2}=\frac{10 g}{2 g}=5 g

N=N^o-\text{sample decayed}=10 g-5 g=5 g, time = t

\ln[5 g]=-0.231 day^{-1}\times t\ln[10]

\ln[\frac{5}{10}]=-0.231\times t

\ln\frac{1}{2}=-0.693=-0.231\times t

t = 3 days

It will take 3 days for half of a 10 g sample to decay.

3 0
3 years ago
‘By using displacement reactions it is possible to deduce the order of reactivity of the halogens.’
Rashid [163]

Answer:

Explanation:

The halogens have seven electrons in their outermost shell. Each halogen atom lacks a single electron to make their octet a complete one. Elements in the halogen group are univalent and also acceptors of electrons. They are all non-metals and oxidizing agents. The oxidizing power of the halogens decreases from top to down the group. This is why the more powerful halogens displaces a less powerful one from simple salts.

         Cl₂ + 2KBr → 2KCl + Br₂

         Cl₂ + 2KI → 2KCl + I₂

          Br₂ + 2KI → 2KBr + I₂

          I₂ + 2KCl → No reaction

           

7 0
3 years ago
To find the atomic mass (atomic weight) of an atom you need to know.......
Talja [164]
Im pretty sure its A.) How many protons
7 0
3 years ago
If the pH of a 1.00-in. rainfall over 1300 miles2 is 3.30, how many kilograms of sulfuric acid, H2SO4, are present, assuming tha
Jobisdone [24]

Hey there!:

Volume of rainfall = Area X height


Height = 1 in = 0.254 dm


1mile2 = 2.59 X 10⁸ dm²

so 1300 miles² = 3367 *10⁸ dm²

Volume = 0.254 * 3367 * 10⁸ = 855.218 * 10⁸ dm³

Also,


H2SO4  ionizes as  :

H2SO4 --> H⁺ + HSO4⁻


Ka1 is very high  so it completely dissociates , due to first dissociation [H⁺] = Concentration of H2SO4


HSO4⁻  --> H⁺  + SO₄⁻²

We also consider it as high dissociation :


so each mole of H2SO4 will give 2 moles of H⁺ (proton)


pH = 3.30  = -log[H⁺]


So [H+] = 0.000501 M = 0.000501 moles / L or moles / dm³

Volume = 855.218 * 10⁸dm³


so moles of H+ present in this volume:

= 0.000501 * 855.218 *10⁸ = 4.28* 10⁷moles


So moles of H2SO4 = 4.28 * 10⁷ / 2 = 2.14 * 10⁷ moles

Molecular weight of H2SO4 = 98 g / mol

Mass of H2SO4:

Moles X molecular weight = 98 * 2.14 X 10⁷ grams = 209.72 * 10⁷ grams in kg:  

= 2.09 X 10⁶Kg

Hope that helps!

7 0
3 years ago
What’s science in science
dimulka [17.4K]

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)

Explanation:

7 0
3 years ago
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