The accurate relative atomic mass of iron, Fe, is 55.8. Explain why the accurate relative atomic mass is not a whole number.
1. The accurate relative atomic mass of iron, Fe, is 55.8. Explain why the accurate relative atomic mass is not a whole number.
Nilai nomor massa besi yang kita gunakan adalah bentuk rerata dari isotop-isotop besi yang ada di alam. karena sifatnya yang merupakan rata-rata, maka bukanlah hal yang mengherankan kalau hasilnya dalam bentuk desimal seperti 55,8.
mau jawab pakai bahasa Inggris juga, tapi bingung akunya ._.
2. what is the atomic number and mass number of lithium?
atomic number: 3
mass number: 6,941 u 0.002 U
3. The average mass of 9 sheep is 35 kg. The average mass of 9 sheep and 1cow is 64 kg. What is the mass of the cow?
Jawaban:
The mass of the cow is 325kg
Penjelasan:
TobeKnown:
9 sheep = 35 kg
9 sheep + 1 cow = 64 kg
TobeAsked:
mass of the cow = . . . . ?
Solving:
as 9 sheep + 1 cow is 64 kg, so that the total average mass of those 10 animals = 64 kg
total average = [tex]\frac {(9 × 35) + (cow)}{10}[/tex] = 64
(315) + (cow) = 64 × 10
315 + cow = 640
cow = 640 - 315
cow = 325 kg
4. 4 sacks of corn kernels are shown below.-what is their Average mass?-What is the total mass of corn kernels ?
4 kernels = 15kg, 6kg, 10kg, 5kg
total mass of corn kernels
= 15+6+10+5
= 36kg
Average = total data/frequency
= (15+6+10+5)/4
= 36/4
= 9 kg
So, the average mass is 9kgand the total mass is 36kg
5. The average mass of 2 chairs is 12 kg. The mass of one of the chairs is 9 kg. What is the mass of the other chair?
Jawaban:
15kg
Penjelasan dengan langkah-langkah:
[tex]12 = \frac{9 + x}{2} \\ 9 + x = 12 \times 2 \\ 9 + x = 24 \\ x = 24 - 9 \\ x = 15[/tex]
Semogamembantu!
Jawaban:
the mass of the other chair is 15 Kg
Penjelasan dengan langkah-langkah:
Diketahui : average (rata-rata) mass of 2 chair 12 Kg
The mass of one of the chairs is 9 Kg
the mass of the other chair = x
[tex] \frac{9 + x}{2} = 12 \\ x = 15[/tex]
6. The average mass of 8 students is 35 kg. The average mass of 8 students and 1 teacher is 39 kg. What is the mass of the teacher? help<3
Average mass 8 student = 35kg
Average 8 student + 1 teacher = 39kg
Mass of the teacher?
Average 8 student formula :
(Summation mass of 8 student) ÷ 8 = 35
y ÷ 8 = 35
y = 35 x 8
y = 280
Average 8 student + 1 teacher formula :
(Summation mass of 8 student + mass teacher) ÷ 9 = 39
(280 + mass tecaher) = 39 x 9
280 + mass teacher = 351
mass teacher = 71
∴ mass of the teacher is 71 kg
7. Two elements X (atomic mass 16) and Y (atomic mass 14) combine to form compounds A, B and C. The ratio of different masses of Y which combines with fixed mass of X in A, B and C is 1 : 3 : 5. If 32 parts by mass of X combine with 84 parts by mass of Y in B, then in C, 16 parts by mass of X will combine with …a. 14 parts by mass of Yb. 42 parts by mass of Yc. 70 parts by mass of Yd. 82 parts by mass of Y
Matter : Stoichiometry
Sub matter : Dalton's Law
Ratio mass of X and Y
X ÷ Y = 16 ÷ 14
= 8 ÷ 7
Mass of X constant, forming 3 compounds of XY with ratio as follows:
A ----> Ya = 1
B ----> Yb = 3
C ----> Yc = 5
In Dalton's law, make one elements at same weight.
In this case mass of X is same/constant.
Compound A
X ÷ Y = 32 ÷ mass Ya
8 ÷ 7 = 32 ÷ mass Ya
Mass of Ya = 28
Compound B
X ÷ Y = 32 ÷ Yb
8 ÷ 7 = 32 ÷ 3Ya
Yb = 84 ----> appropiate with data known (84 parts)
Compound C
X ÷ Y = 16 ÷ Yc
= 32 ÷ 2 Yc
= 32 ÷ 2 (5× Ya)
= 32 ÷ 2 (5×28)
= 32 ÷ 140
Then if 16 parts of mass X will combine with 70 part by mass of Y
Answer is C.
#ChemistryIsFun
8. Jisim molekul relatif bagi M2(SO4)3 ialah 342. Berapakah jisim atom relatif bagi unsur M? [Jisim atom relatif: O = 16, S = 32] The relative molecular mass of M2(SO4)3 is 342. What is the relative atomic mass of element M? [Relative atomic mass: 0 = 16, S = 32] А 27 B 54 С 118D 123
Jawaban:
A. 27
Penjelasan:
Mr [tex]M_{2}(SO_{4})_{3}[/tex] = (2 x Ar M) + (3 x Ar S) + (12 x Ar O)
342 = (2 x Ar M) + (3 x 32) + (12 x 16)
342 = (2 x Ar M) + 96 + 192
342 = (2 x Ar M) + 288
342 - 288 = 2 x Ar M
54 = 2 x Ar M
Ar M = [tex]\frac{54}{2}[/tex] = 27
9. 3. Mercury has a relative atomic mass of 200. How many calcium atoms make up the same relative atomic mass as one atom of mercury?4. The sum of the relative atomic masses of four nitrogen atoms is equal to the relative formula mass of XO. What is X? need answer asap
Jawaban:
3. 4Ca
4. X=Ti
Penjelasan:
Trust me, I'm an engineer
10. If the atomic mass of an element is 60 and its atomic number is 28, what is the number of neutrons?
Jawaban & Penjelasan:
the number of neutrons is atomic mass - atomic number
60 - 28 = 32
so the number neutrons is 32
11. K4Fe(CN)6.3H2O is the chemical formula of potassium hexacyanoferrate(III) trihydrate. What is the relative mass of this compound? [Relative atomic mass: H=1; C=12; N=14; O=16: K=39; Fe=561
relative mass of that comlound is 422
12. The average mass of 9 sheep is 35 kg. The average mass of 9 sheep and 1cow is 64 kg. What is the mass of the cow? (Bukan di translate ye)
rata rata massa 9 domba = 35 kg
rata rata massa 9 domba + 1 sapi = 64 kg
berapa massa sapi?
64 - 35 = 29 kg
13. known mass of 10 L. of nitrogen gas is 5 grams.at a certain temperature and pressure (T,P) calculate the relative atomic mass(Ar) of 20 L. AO2,which has a mass of 44 grams of gas?
Greetings Panji,
We’re going to utilize the Avogadro constant. P.V = n.R.T , since it was known that the temperature and pressure are at a certain level , assume as identical. Therefore we can cross out P, T, and R too because (R is a constant of 0.082), from this elimination we got the rule of Avogadro where we could compare volume and moles (gr/mr). A simple math will reveal that the second gas has 5/14 moles. We can break open the moles formula by dividing mass and the relative atomic mass.
There u go :D
14. pada saat membuat worksheet baru,worksheet baru tersebut akan muncul di...worksheet yang sudah ada lebih dahulu.
Jawaban:
tab sheet
Penjelasan:
yang ada dibawah
15. Mr Lim put durians into 23 baskets. The average mass of the 23 baskets of durians was 10.15 kg.find the mass of the last basket of durians if the average mass of the first 22 baskets of durianswas 9.09 kg.
Jawaban:
you can calculate the below equation
Penjelasan dengan langkah-langkah:
to find the last durian's mass, just substract the total mass of 23 durians with the total mass of the first 22 durians.
The mass of the last durians= 23x10.15-22x9.09
16. a group of children had a total mass of 132kg. the average mass of a child was 33kg. how many children were there in the group
132 + 33 = 165 kg.
#goodluck132 kg ÷ 33 kg = 4 kids
17. Given: Mr X2 CO3=106. if Ar C=12. 0 16, the relative atomic mass of X is...
Jawaban:
relative atomic mass (Ar) of X is 23
Penjelasan:
Mr X2CO3 = 106
Mr X2CO3 = (2 x Ar X) + (Ar C) + (3 x Ar O)
106 = (2 x Ar X) + 12 + (3 x 16)
106 = (2 x Ar X) + 12 + 48
106 = (2 x Ar X) + 60
106 - 60 = (2 x Ar X)
46 = 2 x Ar X
46 : 2 = Ar X
23 = Ar X
18. The average mass of some mangoes is 225 g. There are 8 mangoesaltogether. Find the total mass of all the mangoes.
Jawaban:
1.800 g
Penjelasan dengan langkah-langkah:
Rata-rata 8 mangga : 225 g
total berat mangga (a) / banyaknya benda (b) : 225 g
a / 8 = 225 g
a = 225 g x 8
= 1.800 g
Jadi total massa dari seluruh mangga adalah 1.800 gram
19. Write diwn the mass number, atomic number, proton electron and neutron of the element belows : a. 27Al13 b. 26Cl17 c. 39K19
1.)27Al13=
mass.number= 27
atomic number=proton=elektron= 13
neutron=mass.number - proton= 27-13=14
2.)26Cl17
mass.number= 26
atomic number=proton=elektron= 17
neutron=mass.number - proton= 26-17= 9
3.) 39K19
mass.number= 39
atomic number=proton=elektron= 19
neutron=mass.number - proton = 39 -19 =20
20. Bryan, Rexie and Marco have an average mass of 48kg. Bryan is 7 kg heavier than Rexie.Rexie is 8.5 kg heavier than Marco.What is Marco's mass?
Rexie = y
Marco = x
Bryan = 7 kg + Rexie = 7 + y
Rexie = y = 8,5 kg + Marco = 8,5 + x
[tex] \frac{bryan + rexie + marco}{3} = 48 \: kg \\ {7 +y + 8.5 + x + x} = 48 \times 3 \\ 7 + 8.5 + x + 8.5 + 2x = 144 \\ 24 + 3x = 14.4 \\ 3x = 144 - 24 \\ 3x = 120 \\ x = 40 \: kg \\ [/tex]
So, Marco's mass is 40 kg
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Mei 01, 2023
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