what is the atomic number and mass number of lithium?
1. what is the atomic number and mass number of lithium?
atomic number: 3
mass number: 6,941 u 0.002 U
2. 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
3. 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
4. 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]
5. Zalina's mass is 5 times as Magdalene's mass. What is the ratio of Magdalene's mass to the total mass of the two girls?
Penjelasan dengan langkah-langkah:
Massa Zalina adalah 5 kali massa Magdalena. Berapa perbandingan massa Magdalena dengan massa total kedua gadis itu?
6. 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
7. 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
8. The mass of a bag of 10 identical cubes is 768 g. The mass of the bag is 120 g. What is the mass of each cube?
Answer:
64.8 g
Explanation with steps:
mass of 10 cubes = total mass - mass of the bag
mass of 10 cubes = 768 g - 120 g
mass of 10 cubes = 648 g
therefore, the mass of each cube is 648 g / 10 = 64.8 g
9. the mass of pencil 115 grams the mass of a book is 385 grams what is the their total mass
Jawaban:
500 mass is the total mass
The total mass is115 grams + 385 grams=500 grams
So,the total mass is 500 grams
10. The mass of a box with 2 marbles is 4.3 gram. The mass of each marbles is 1,3 gram. What is the mass of
Jawab:
the mass of a box is 1,7 gram.
Penjelasan dengan langkah-langkah:
11. The mass of 30 identical books is 9.6 kg. What is the mass of each book?
Jawab:
0,32 kg
Penjelasan dengan langkah-langkah:
the mass of each book
= 9.6 kg/30
= 0,32 kg
12. What is the atomic weight of silver?
Silver nerver and atomic yes.. Never dead is silver the worl go play plK
13. a kitten and a basket has a mass of 3 kg . A hamster and a similar basket has a mass of 1.4kg . the mass of the kitten is 5 times the mass of the hamster .a. what is the mass of the hamster ? , b. what is the mass of the kitten ?
kitten = x ,hamster = y and baskest = z
x+z = 3 kg
y+z = 1,4 kg
z = x- y = 3 kg - 1,4 kg = 1,6 kg
x+y = 4,4 kg - 1,6 kg = 2, 8 kg
x = 5y
5y +y = 2,8 kg
6y = 2,8 kg
y = 2,8 kg /6
y = 0,47 kg
x = 5y
= 5 * 0,47 kg
= 2,35 kg
a. mass off hamster = 0,47 kg
b. mas off kitten = 2,35 kg
bonus...mass of basket = 1,6 kg
thank's
14. The mass of a dictionary is 1.28 kg. The mass of the dictionary is twice the mass of a storybook. The mass of an encyclopaedia is 1.4 kg more than storybook. What is the mass of the encyclopaedia?
Jawaban:
2.04 kg
Penjelasan dengan langkah-langkah:
Jika berat sebuah kamus 2 kali berat buku cerita, maka berat buku cerita adalah setengah dari berat kamus. Sehingga berat ensiklopedia adalah
1.4 kg + (1.28 ÷ 2) kg
= 1.4 kg + 0.64kg
= 2.04 kg
15. 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 ._.
16. the mass of 1 orange is 110 grams what is the mass of 5 oranges?
Jawaban:
5 orange × 110 grams = 550 grams
Jawaban:
If 1 orange is 110 grams,so the mass of 5 oranges is :
= 110 grams x 5
= 550 grams
17. 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
18. what is the law of conservation of mass ?
Jawaban:
suatu hukum yang menyatakan massa dari suatu sistem tertutup akan konstan meskipun terjadi berbagai macam proses di dalam sistem tersebut (dalam sistem tertutup Massa zat sebelum dan sesudah reaksi adalah sama (tetap/konstan)
Penjelasan:
19. 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
20. What is the total charge of all the electrons in a 12-kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197u.)
Jawaban:
Penjelasan:
What is the total charge of all the electrons in a 12kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197u).
I have tried the following but my book gives a different answer.
I know...
1 atomic mass= 1.6605x10^-27kg
gold atomic mass=197u
79 electrons
e charge= 1.6x10^-19C
step 1: 1.6605x10^-27 * 197 = 3.27x10^-25kg weight of a gold atom
step 2: 3.27x10^-25kg / 12kg = 2.725X10^-26 atoms in the bar of gold
step 3: 79e * 2.725x10^26 = 2.15x10^-24 number of electrons in bar of gold
step 4: 2.15x10^-24 * 1.6X10^-19C = 5.978X10^-19
But the answer in the book says the answer should be -4.6X10^8C and the net charge is zero.
Also, I am not understanding why the net charge of the bar is zero.
Can you explain this as well
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