Consider the reaction for the commercial preparation of ammonia ; synthesis of ammonia (NH3) from the reaction between nitrogen and hydrogen. a) How many moles of hydrogen are needed to prepare 312 moles of ammonia? b) How many grams of hydrogen is this?
1. Consider the reaction for the commercial preparation of ammonia ; synthesis of ammonia (NH3) from the reaction between nitrogen and hydrogen. a) How many moles of hydrogen are needed to prepare 312 moles of ammonia? b) How many grams of hydrogen is this?
11010292928822
Penjelasan:
soriy ttayqyquq
2. How many moles of sodium bromide can be formed from 1.55 moles of aluminum bromide?
Jawaban:
12020729629101
Penjelasan:
kalo salah maap
3. 8. The following pie chart presents the blood groups for large sample of people.Group BGroup ABGroup AGroup 0(a) What is appproximate percentage of people with group A blood? If the pie isbased on a sample of 500 people, approximately how many of those 500 peoplehave group A blood?(b) What is the approximate percentage of people with group B blood? Assumingthe pie cahrt is based on sample of 500 people, approximately how many ofthose 500 people have group B blood?
Jawaban:
8. Diagram lingkaran berikut menyajikan golongan darah untuk sampel besar orang.
Grup B
Grup AB
grup A
Grup 0
(a) Berapa persentase perkiraan orang dengan darah golongan A? Jika pai itu
berdasarkan sampel 500 orang, kira-kira berapa dari 500 orang tersebut
memiliki darah golongan A?
(b) Berapa perkiraan persentase orang dengan darah golongan B? Asumsi
pie cahrt didasarkan pada sampel 500 orang, kira-kira berapa banyak
500 orang itu memiliki darah golongan B?
Penjelasan:
maaf y aku cuma tau artiny
4. Apakah sama dengan potensial of hydrogen?
Apakah sama dengan potensial of hydrogen?
pH singkatan dari potential of Hydrogen yang merupakan besarnya derajat keasaman dari suatu zat.
PembahasanPenentuan pH suatu larutan dibedakan menjadi 2 yaitu : pH teoritis dan pH pengukuran. pH teoritis merupakan besaran pH dari suatu zat atau larutan yang ditentukan berdasarkan konsep teoritis atau teori asam basa yang berlaku melalui persamaan kimia dan perhitungan matematis.
Perhitungan teoritis dalam menentukan pH ditentukan dari :
pH = - log [H⁺] (untuk larutan asam)
pOH = - log [OH⁻] (untuk larutan basa - potensian ion hidroksida)
pH + pOH = 14
Untuk menentukan [H⁺] dan [OH⁻] adalah sebagai berikut :
asam kuat, [H⁺] = a × Ma
asam lemah, [H⁺] = √(Ka × Ma)
basa kuat, [OH⁻] = b × Mb
basa lemah, [OH⁻] = √(Kb × Mb)
pH pengukuran merupakan besarnya pH dari suatu zat atau larutan yang ditunjukkan langsung dari alat ukur pH yang digunakan tanpa melalui perhitungan. Besar pH ditunjukkan langsung dari alat ukur yang digunakan yang telah melalui kalibrasi dan baku. Alat ukur pH yang biasanya dipakai antara lain : pH meter, indikator universal, pH portabel.
Pelajari lebih lanjut
1. Materi tentang asam brainly.co.id/tugas/12528789
2. Materi tentang basa brainly.co.id/tugas/2577309
3. Materi tentang garam brainly.co.id/tugas/807111
4. Materi tentang Ka brainly.co.id/tugas/5102779
5. Materi tentang Kb brainly.co.id/tugas/1790803
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Detil jawabanKelas: XIMapel: KimiaBab: Asam dan BasaKode: 11.7.5Kata Kunci: asam kuat, asam lemah, basa kuat, basa lemah, Ka, Kb, pH, pOH
5. Two moles of aluminum consist of...... atoms (L = 6.02 x 10^23)
x = n x L
x = 2 x 6,02 x 10^23
x = 12,02 x 10^23
x = 1,202 x 10^24
6. For the given reaction C5H12 + 8 O2 → 5 CO2 + 6 H2O, If the reactants C5H12 & O2 are having 2 moles an 8 moles of initial feed respectively. How many moles of C5H12 are there when the reaction completes?
Jawaban:
1 mol C5H12
Penjelasan:
pakai cara yang di gambar ya
semoga bermanfaat
7. Tutorial 1.3- StoichiometrySemester 1 19/2An impure sample of zinc weighing 55.0 g reacts with 500 mL 4.0 M hydrochloric aciproduce 18.0 L hydrogen gas at s.t.p.Calculate the number of moles of hydrogen gas produced.Determine the limiting reactant.Determine the percentage of zinc in the impure sample.A sample of 1.55 g of iron ore is dissolved in an acid solution in which the iron is consinto Fe2+. The solution formed is then titrated with KMnO4 which oxidises Feat to Fe3+the MnO4 ions are reduced to Mn2+ ions. 92.95 mL of 0.020 M KMnO, is required ftitration to reach the equivalence point.(a) Write the balanced equation for the titration.Calculate the percentage of iron in the sample.
Jawaban:
write the balanced equation for the titration
8. The number of moles of solute present in 1 kg of a solvent is called its A. Molality B. Molarity C. Normality D. Formality
A. Molality
pembahasan :
pertanyaannya adalah jumlah mol di larutan yang ada pada 1 kg pelarut disebut apa, jawabannya ada molalitas yaitu (n). sedangkan, molaritas (M) adalah konsentrasi suatu zat pada larutan tertentu.
9. acetic acie has Ka= 10^-5 . If 0,2 moles of this acid is mixed 0,02moles of sodium acetate in one liter of water, a buffer is formed. Calculate pH of this solution .
pH = 4
Solution :
Determining the concentration of acid
[CH3COOH] = 0,2mole/1L = 0,2M
Determining the concentration of conjugate base
[CH3COO-] = 0,02mole/1L = 0,02
Determining the concentration of H+ and pH
[H+] = Ka × [CH3COOH]/[CH3COO-]
[H+] = 10^-5 × 0,2M/0,02M = 10^-4
so :
pH = -log [H+]
pH = -log 10^-4
pH = 4
This, pH of the Solution is 4
10. aku ada pr nih.. suruh buat sample of memo ..sample of memo itu gimana ?
kaka disuruh membuat salah satu contoh memo
11. 1. If you assume that the molecular weight of sugars is 342 g/mol, how many moles of sugar are there in one serving? 2. If you assume that the molecular weight of sodium is 23 g/mol, how many moles of sodium are there in one serving? 3. How does the number of atoms of sodium in one serving compare to the number of molecules of sugar?
yessssssssssssssssssss
Jawaban:
ya ndak tau, kok tanya saya:v
Penjelasan:
makasih poinnya
lumayan dapet 50 poin:v
12. How many molecules of CO2 are the in 4.56 moles of CO2 ?
° STOIKIOMETRI °
Given
n = 4,56 moleL = 6,02 • 10²³Ask
X = ?Answer
To answer this question, we can use mole concept.
[tex] \Boxed {X = n \cdot L} [/tex]
So the answer
[tex] X = n \cdot L \\ X = 4,56 \cdot 6,02 \cdot 10^{23} \\ X \approx 2,75 \cdot 10^{23} [/tex]
13. 0.08 moles of sulfuric acid in 2 litres of solution has a Ph?
n (moles) = M / V
M (concentracion) = n x V = 0,08 moles x 2 Litres = 0,16 M
Since H₂SO₄ is strong acid, we must use this formula:
[H⁺] = acid valence x Concentration
[H⁺] = 2 x 0,16 M
[H⁺]= 0,32 M = 32 x 10⁻² M
pH = - log [H⁺]
pH = - log (32 x 10⁻² M)
pH = 2 - log 32
~apply some logarithm properties~
pH = 2 - 5 log 2
pH = 0,5
That gives us pH of said acid is 2-5log2.
I hope this helps~
14. How many molecules of CO2 are the in 4.56 moles of CO2 ?
Jawaban:
Thus, the number of molecules of carbon dioxide is 6.23×1022 molecules 6.23 × 10 22 molecules .
15. If a 3 g sample of alkane is burned, 5,4 g of water vapor is produced. What is the molecular formula of that hydrocarbon?
anda anak mana sih?
ingat alkane memiliki rumus molekul umum CnH2n+2 paham? so... anda misalkan CxHy, paham?, kemudian tulis reaksinya
CxHy(g) + O2 (g) --> CO2 (g) + H2O (g)
kemudian anda cari mol H2O = gram/Mr = 5,4/18 = 0,3 mol
terus gini, karena tidak di ketahui massa CO2 nya kita bisa otak2 atik
kemudian kita bisa gunakan perbandingan molnya...
kalo saya misal pake C2H6 (ethane), so...n hitungh mol dari ethane = gram/molar mass = 3/30 = 0,1 mol kan? kemudian masukan ke reaksi :
reaksinya
C2H6 (g) + 3,5 O2 (g) --> 2 CO2 (g) + 3 H2O (g)
0,1 mol _________________________0,3 mol
apakah sesuai dg hitungan awal kita bahwa H2O adalah 0,3 mol?
so... smg membantu...
16. Two moles of aluminum consist of...... atoms (L = 6.02 x 10^23)
x = n x L
x = 2 x 6,02 x 10^23
x = 12,02 x 10^23
x = 1,202 x 10^24
17. Two moles of aluminum consist of...... atoms (L = 6.02 x 10^23)
x = n x L
x = 2 x 6,02 x 10^23
x = 12,02 x 10^23
x = 1,202 x 10^24
18. Find the number of moles of the indicated species: a) 333 mg of Na2B4O7.10H20
Jawaban:
Penjelasan:
[tex]\text{Na}_2\text{B}_4\text{O}_7.10\text{H}_2\text{O}[/tex]
Mr = 2Na + 4B + 8O + 20H
Mr = 2(23) + 4(11) + 17(16) + 20(1)
Mr = 46 + 44 + 272+ 20
Mr = 382
[tex]n = \frac{m}{Mm}\\n = \frac{333}{382}\\n = 0,87 \times 10^-3 \ \text{mol}[/tex]
19. what number of Fe atoms and what amount (moles) of Fe atoms are in 500.0 g of iron
STOICHIOMETRY :
It is known that the mass of Fe (Iron) we have is 500.0g and if we open the periodic table, it is also told that the relative atomic mass (Ar) is equal to approximately 56. So in this case we can find the mole of the iron with :
[tex]n = \frac{m}{Ar/Mr}[/tex]
Where :
n = mole
Ar/Mr = Relative Atomic Mass / Relative Molecular Mass
m = mass
So..
[tex]n = \frac{500}{56} = 8.92 ≈ 9 moles[/tex]
So the answer is 8,92 moles of Fe or approximately 9 moles of Fe
Hope it helps, Shalom!
20. What is the molarity of a solution containing 4 moles of KCl in 2.5 L of solution?
Penjelasan:
dik : n KCl = 4 mol
v = 2,5 L
dit : M = ?
jb :
M = n / v
= 4 mol / 2,5 L
= 1,6 mol/L
semoga membantu :)
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