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Harsh Sethi
Subject: Science
, asked on 28/1/18
Please answer this question and don't send any links!!!
63.
A flask contains 4.4 grams of
C
O
2
gas. Calculate the no. of molecules of
C
O
2
as in the flask. How many atoms of Oxygen are present in the same flask containing 4.4 grams of
C
O
2
gas ? (Atomic mass of C = 12 u, O = 16 u).
Answer
2
Harsh Sethi
Subject: Science
, asked on 28/1/18
Please answer question 61 and please don't send any links.
Answer
1
Harsh Sethi
Subject: Science
, asked on 28/1/18
Answer this please
Answer
1
Harsh Sethi
Subject: Science
, asked on 28/1/18
Please answer this without sending any links !!!
Answer
2
Harsh Sethi
Subject: Science
, asked on 28/1/18
@please answer this without sending any links !!!!
Which of the following has more number of molecules ?
(
i
)
10
g
o
f
n
i
t
r
o
g
e
n
(
N
2
)
(
i
i
)
10
g
o
f
a
m
m
o
n
i
a
(
N
H
3
)
Answer
2
Admya Maini
Subject: Science
, asked on 27/1/18
There are two elements C and B .C emits alpha particles and B emits bita particles.How will the resultant element change
Answer
3
Suvam
Subject: Science
, asked on 26/1/18
46. An element 'X' forms an oxide with formula
X
2
O
3
(a) State the valency of X,
(b) Write the formula of
(i) chloride X. (ii) sulphate of X
47. (a) Define the term mole.
(b) Calculate the no. of
(i) atoms
(ii) molecules in 124 grams of phosphorus.
P
4
(Given atomic mass of P = 31.0 u,
N
A
=
6
.
023
x
10
23
m
o
l
-
1
)
48 (a) What was Thomson's model of an atom?
(b) Write any two observations of Rutherford's model or atom.
49. . What were the conclusions of Rutherford's
α
-
particle scattering experiment.
50. The number of electrons, protons and neutrons of elements are given below:
Element
A
B
C
D
E
Electrons
4
18
17
11
17
Protons
6
18
17
9
17
Neutrons
6
22
20
10
18
(a) Which of them is a cation?
(b) Which of them is an anion?
(c) Which is an atom of an Inert gas?
Answer
3
Suvam
Subject: Science
, asked on 26/1/18
Question number 33, 34, 35, 36, 37
Answer
2
Sms
Subject: Science
, asked on 26/1/18
how do we calculate atomic mass using atomic mass unit
Answer
3
Harsh Sethi
Subject: Science
, asked on 22/1/18
Molecular mass of Mg(OH)2
Answer
4
Shreya Bharti
Subject: Science
, asked on 20/1/18
PLZ ANS WITH STEPS AND FORMULAS
Calculate the number of gram atoms and atoms present in 80 g of sulphur.
(
a
)
2
.
5
,
15
.
05
×
10
23
(
b
)
3
.
5
,
16
.
05
×
10
23
(
c
)
0
.
5
,
13
.
3
×
10
22
(
d
)
2
.
3
,
15
.
05
×
10
23
Answer
2
Shreya Bharti
Subject: Science
, asked on 20/1/18
The chloride of a metal has the formula MCl3. The formula of its phosphate will be:
(a) M2PO4 (b) MPO4 (c) M3PO4 (d) M (PO4)2....PLZ ANS WITH FORMULA AND STEPS
Answer
4
Harsh Sethi
Subject: Science
, asked on 20/1/18
5g of calcium combine with 2g of oxygen to form a compound. Find the molecular formula of the compound. (Atomic mass of Ca=40u;O=16u).
Plzz don't send any links!!!!
Answer
1
Harsh Sethi
Subject: Science
, asked on 20/1/18
In a molecule hydrogen and oxygen are present in the ratio 1: 8 by mass. Deduce the molecular formula of the compound. (Atomic mass: H=1.0u,O=16.0u).
Answer
2
Devhuti
Subject: Science
, asked on 17/1/18
Filled with water is shown in diagram Find the least count of cylinder volume of water filled in measuring cylinder
Answer
2
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What are you looking for?
63. A flask contains 4.4 grams of gas. Calculate the no. of molecules of as in the flask. How many atoms of Oxygen are present in the same flask containing 4.4 grams of gas ? (Atomic mass of C = 12 u, O = 16 u).
(a) State the valency of X,
(b) Write the formula of
(i) chloride X. (ii) sulphate of X
47. (a) Define the term mole.
(b) Calculate the no. of
(i) atoms
(ii) molecules in 124 grams of phosphorus.
(Given atomic mass of P = 31.0 u, )
48 (a) What was Thomson's model of an atom?
(b) Write any two observations of Rutherford's model or atom.
49. . What were the conclusions of Rutherford's particle scattering experiment.
50. The number of electrons, protons and neutrons of elements are given below:
(a) Which of them is a cation?
(b) Which of them is an anion?
(c) Which is an atom of an Inert gas?
Calculate the number of gram atoms and atoms present in 80 g of sulphur.
(a) M2PO4 (b) MPO4 (c) M3PO4 (d) M (PO4)2....PLZ ANS WITH FORMULA AND STEPS
Plzz don't send any links!!!!