Calculate the number of moles of the indicated substance present in each of the following samples. a) 1.95 x 10-3 g of lithium carbonate. b) 4.23 kg of calcium chloride. c) 1.23 mg of strontium chloride.
1. Calculate the number of moles of the indicated substance present in each of the following samples. a) 1.95 x 10-3 g of lithium carbonate. b) 4.23 kg of calcium chloride. c) 1.23 mg of strontium chloride.
The number of moles of the indicated substance present in each of the samples is as follows.
1.95 x 10-3 g of lithium carbonate = 2.64 x 10⁻⁵ moles4.23 kg of calcium chloride = 28.01 moles1.23 mg of strontium chloride = 7.74 x 10⁻⁶ moles(in two decimal places)
Penjelasan:
Data of relative atomic mass
Ar Li = 7Ar C = 12Ar O = 16Ar Ca = 40Ar Cl = 35.5Ar Sr = 88Data of relative molecular mass
Mr of lithium carbonate Li₂CO₃ = 2(7) + 12 + 3(16) = 74Mr of calcium chloride CaCl₂ = 2(40) + 2(35.5) = 151Mr of strontium chloride SrCl₂ = 88 + 2(35.5) = 159The formula: [tex]\boxed{moles~n = \frac{mass~(grams)}{Mr~(g.mol^{-1})} }[/tex]
Calculation
[tex]\boxed{n = \frac{1.95 \times 10^{-3} \, g}{74 \, g.mol^{-1}} = 2.64\times 10^{-5} \,moles\, of \, lithium \, carbonate }[/tex]
[tex]\boxed{n = \frac{4.23 \times 10^{3} \, g}{151 \, g.mol^{-1}} = 28.01 \,moles\, of \, calcium\, chloride }[/tex]
[tex]\boxed{n = \frac{1.23 \times 10^{-3} \, g}{159 \, g.mol^{-1}} = 7.74 \times 10^{-6} \,moles\, of \, strontium \, chloride }[/tex]
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2. *In early days*hydrochloricacid *was done*by *heating*a mixture of sodium chloride*with*ironsulfate. mana kata bertanda kutip yang salah dan apa kata yang benar?
Jawaban:
was done = was made
Penjelasan:
3. Lithium reacts with water to form lithium hydroxide. What mass of lithium is required to produce 12 g of lithium hydroxide? (A) 2.0 g (B) 3.5 g (C) 7.0 g (D) 12 g
Jawaban:
b. 3,5 gram
Penjelasan:
dengan nilai koefisien reaksi kita tahu perbandingan mol reaktan dan produk
jawaban terlampir, semangat belajarnya
4. complete sentence consisting of a combination of personal pronouns, indefinite pronouns, and demostrative pronouns
Jawaban:
What sentences are we talking about, again?
Penjelasan:
I really want to get a bike, even though my father has rejected my proposal for years. Therefore, I am now saving my money to buy the bike on my own.
what senteses we talking, about?
5. An example of a 0.6025 g of chloride salt was dissolved in water and its chloride was precipitated with excess silver nitrate. The silver chloride precipitate is filtered, washed, dried and weighed 0.7134 g. calculate% Cl in the example
Jawaban:
kita anggap sampelnya adalah XCl
XCl + AgNO3 --> AgCl + XNO3
berat AgCl adalah 0,7134 gram
berat Cl di AgCl = berat Cl di XCl
berat Cl di AgCl = (Ar Ag / Mr AgCl) x berat AgCl
berat Cl di AgCl = (108 / 143,5) x 0,7134
berat Cl di AgCl = 0,53691 gr
% Cl pada sampel = (massa Cl / massa sampel) x 100
% Cl pada sampel = (0,53691 / 0,6025) x 100
% Cl pada sampel = 89,11%
Penjelasan:
:"
6. the Hawaiian alphabet, introduced by misionaries in the 1820's,..... and only seven consonantsa. the five vowels consist ofb. consisting of five vowelsc. that consist of five vowelsd. consist of five vowels
Jawaban:
d.consist of five vowels
Penjelasan:
maaf kalau salah
7. Write a dialogue example consisting of 3 people about leaving
Devin : it was nice playing with you guys here but I gotta go home
Ian : hey please stay Julie
Bailey :yeah I agree with Ian
Devin: but I gotta go study
Ian&Bailey:ok bye see you tomorrow at school!
Devin: ok bye
8. in which compounds are pairs of electrons shared between atoms? 1) methane 2) potassium iodide 3) sodium chloride a. 1 only, b. 2 only, c. 1 and 3, d. 1, 2 and 3
1 Methane
semoga benar adanya
9. Ephrahim has 12 coins in his pocket, consisting of quarters and dimes only. If he has $2.10 in his pocket, how many of each coin does he have?
x = quarters ($ 0,25)
y = dimes ($ 0,10)
x + y = 12
0,25x+0,1y = 2,1
eliminasi y:
0,1x + 0,1y = 1,2
0,25x+0,1y = 2,1 (-)
-0,15x = -0,9
x = 6 coins
subtitusi x = 6:
y = 12 - x
= 12-6
= 6 coins
he has each 6 coinsquarter = x
dimes = y
1 quarter = 25 cent = $0,25
1 dimes = 10 cent = $0,1
x + y = 12...........x = 12 - y
0,25x + 0,1y = 2,10
0,25x + 0,1y = 2.10
0,25(12 - y) + 0,1y = 2,10
3 - 0,25y + 0,1y = 2,10
-0,15y =-0.9
y = 6
x =12 - 6 = 6
Eprahim has 6 quarters ($1,50) and 6 dimes ($0,6)
10. A 3.245 gram sample of a titanium chloride was reduce with sodium metallic titanium. After the resultant sodium chloride was washed out. The residual titanium metal was dried. And weighted 0.819 gram. What is the empirical formula of titanium chloride?
[tex]Titanium \ c. + Sodium \ m. \ titanium \rightarrow Sodium \ c. + Titanium \\ mass_{titanium} = 0.819 \ gram \\ mass_{titanium \ c.} = 3.245 \ gram \\ mass_{chloride} = mass_{titanium \ c.} - mass_{titanium} \\ mass_{chloride} = 3.245 - 0.819 = 2.426 \ gram \\ \\ mole_{titanium} : mole_{chloride} = \frac{mass_{titanium}}{molar \ mass_{titanium}} : \frac{mass_{chloride}}{molar \ mass_{chloride}} \\ molar \ mass_{titanium} = 47.867 \ g/mol \\ molar \ mass_{chloride} = 35.453 \ g/mol[/tex][tex]mole_{titanium} : mole_{chloride} = \frac{0.819}{47.867} : \frac{2.426}{35.453} \\ mole_{titanium} : mole_{chloride} = 0.017 : 0.068 \\ mole_{titanium} : mole_{chloride} = 1 : 4 \\ \\ In \ conclusion, \ the \ empirical \ formula \ for \ titanium \ chloride \ is: \\ TiCl_4[/tex]
11. Construct a paragraph at least consisting of 5 future forms!
Jawaban:
In the future, technology will have advanced to the point where robots will be utilized to handle repetitive tasks in ports, increasing efficiency and reducing human errors. Automated cargo handling systems will be implemented to streamline the loading and unloading process. The use of drones and other autonomous vehicles will also become increasingly common for cargo inspections and security patrols. Smart ports will be developed to utilize data and analytics to optimize operations and reduce congestion. Furthermore, the use of blockchain technology will be adopted to improve transparency and security in supply chain management and customs clearance.
12. Make a complete sentence consisting of a combination of personal pronouns, possessive pronouns, and reflexive pronouns
Jawaban:
saya harus isi jawabannya giamana
13. bantu jawab consisting of dan statements to persuade
Kelas: SMA
Pelajaran: English
Kategori: reading comprehension
Pembahasan:
the content (consisting of) : The special talk by The B-Fast owner on the importance of its mineral water product.
Statement to persuade: ' The company offers IDR 75,000 ticket plus IDR 20,000 voucher for the purchase of 10 boxes of B-Fast at this talk. So hurry up.'
14. They speak____ french nor german, but a strange mixture of the two. A. neither B. either c. both d. not only
Jawaban:
B. either
Penjelasan:
They speak either french nor german, but a strange mixture of the two.
artinya = Mereka berbicara baik prancis atau jerman, tapi campuran yang aneh dari keduanya.
Semoga Membantu
Jawaban:
B. either
.............
15. A democractic government is a government consisting of representatives who are... L
a democratic government is a government consisting of representatives who are...
= elected indirectly and elected by the people (maybe)
^_^
16. what is the difference of homogeneus mixture and heterogeneus mixture!
homogenous = solution
separate using - distillation, evaporation to dryness, crystallization
heterogenous = suspension
separate using - filtration, separating funnel
17. what is the difference between waiting items consisting of one, compared to goods consisting of more than one
Jawaban:
Artinya:apa perbedaan barang tunggu yang terdiri dari satu, dengan barang yang terdiri lebih dari satu
Penjelasan:
Maaf kalau salah:-|
18. what is mixture and types of mixture?
Jawaban:
A mixture is composed of one or more pure substances in varying composition. There are two types of mixtures: heterogeneous and homogeneous. Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout.
19. Write a dialogue consisting of 4 sentences. Include expression of giving & responding to compliment !
⚕️: Hey, how are you doing?
: I'm awesome, thank you for asking
⚕️: you looks so beautiful tonight
: thank you, you looks more beautiful by the way
20. . Make a dialogue consisting of 2 people in which tothe expression of understanding!
Jawaban:
Lugo : Sorry to bother you
Etar: It’s Okay. What’s up?
Lugo : Can you tell me how to answer these questions?
Etar: Let me see. First, you must read the text. Then, you read the questions, and focus on the paragraph. Are you with me?
Lugo : What do you mean by focusing on the paragraph?
Etar: Well, to find the answer to question number 3, you must focus on paragraph two.
Lugo : I see. I know what you mean. Thanks.
Penjelasan:
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