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Evgesh-ka [11]
3 years ago
10

A sample of water is heated from 10.0 degrees Celcius to 15.0 degrees Celcius by the addition of 125 Joules of heat. What is the

mass of the water?
Chemistry
1 answer:
geniusboy [140]3 years ago
6 0

Answer:

125 = 5*4.186*m

m = 125 / 5*4.186 = 5.97g of water.

Explanation:

The water is increased by 5 degrees. This means that for every gram of water, it takes 5*4.186 J to increase the temperature by 5 degrees, aka 5*4.186 J/g

hope this help:)

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What is the density of carbon dioxide gas if 0.297 g occupies of 150.0 mL?
Helga [31]
P = m/v
P = 0.297g/150.0ml
P = 1.98x10^-3 g/ml
3 0
3 years ago
Specify the l and ml values for n = 4.
Bumek [7]

Answer : The specify the l and ml values for n = 4 are:

At l = 0,  m_l=0

At l = 1,  m_l=+1,0,-1

At l = 2,  m_l=+2,+1,0,-1,-2

At l = 3,  m_l=+3,+2,+1,0,-1,-2,-3

Explanation:

There are 4 quantum numbers :

Principle Quantum Numbers : It describes the size of the orbital. It is represented by n. n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as m_l. The value of this quantum number ranges from (-l\text{ to }+l). When l = 2, the value of m_l will be -2, -1, 0, +1, +2.

Spin Quantum number : It describes the direction of electron spin. This is represented as m_sThe value of this is +\frac{1}{2} for upward spin and -\frac{1}{2} for downward spin.

As we are given, n = 4 then the value of l and ml are,

l = 0, 1, 2, 3

At l = 0,  m_l=0

At l = 1,  m_l=+1,0,-1

At l = 2,  m_l=+2,+1,0,-1,-2

At l = 3,  m_l=+3,+2,+1,0,-1,-2,-3

6 0
3 years ago
What is the oxidation number b in h3bo3?
Goryan [66]
H is positive 1 and o is negative 2 so 3+b-6=0 and solve for b to get b=3
5 0
4 years ago
Atomic weight of first 30 element in periodic table ​
Andreyy89

Answer:

The answer is in the explanation

Explanation:

The atomic weight of an element is defined as the mass of 1 mole of atoms of the element. To find the atomic weight of the first 30 elements we must see our periodic table:

#      Element       Atomic Weight

1       Hydrogen 1.008

2 Helium 4.0026

3 Lithium 6.94

4 Beryllium 9.0122

5 Boron 10.81

6 Carbon 12.011

7 Nitrogen 14.007

8 Oxygen 15.999

9 Fluorine 18.998

10 Neon 20.180

11 Sodium 22.990

12 Magnesium 24.305

13 Aluminium 26.982

14 Silicon 28.085

15 Phosphorus 30.974

16 Sulfur 32.06

17 Chlorine 35.45

18 Argon 39.948

19 Potassium 39.098

20 Calcium 40.078

21 Scandium 44.956

22 Titanium 47.867

23 Vanadium 50.942

24 Chromium 51.996

25 Manganese 54.938

26 Iron 55.845

27 Cobalt 58.933

28 Nickel 58.693

29 Copper 63.546

30 Zinc 65.38

7 0
3 years ago
36g of an alloy of copper and zinc contains 45% copper. how much pure copper do you need to add in order to get a 60% copper all
iogann1982 [59]
First, you need to count copper mass in alloy.
Second, you have to make an equation an find x ( the copper mass must be added). The answer is: 13,5g pure copper

7 0
3 years ago
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