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baherus [9]
3 years ago
12

PLEASE HELP, dana wants...​

Chemistry
2 answers:
tensa zangetsu [6.8K]3 years ago
8 0

Answer:

C

Explanation:

umka21 [38]3 years ago
6 0

Answer:

I think A, not sure

Explanation:

her weight depends on the force of gravity

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What is the image of (2,8) after a reflection over the line y = x?
Serggg [28]

Answer:

4,16

Explanation:

Multiply each by 2.

2 x 2 = 4

8 x 2 = 16

6 0
3 years ago
Read 2 more answers
How many 3-liter balloons could the 12-L helium tank pressurized to 160 atm fill? Keep in mind that an "exhausted" helium tank i
vaieri [72.5K]

Answer:

The 12L helium tank pressurized to 160 atm will fill <em>636 </em>3-liter balloons

Explanation:

It is possible to answer this question using Boyle's law:

P_1V_1=P_2V_2

Where P₁ is the pressure of the tank (160atm), V₁ is the volume of the tank (12L), P₂ is the pressure of the balloons (1atm, atmospheric pressure) And V₂ is the volume this gas will occupy at 1 atm, thus:

160atm×12L = 1atm×V₂

V₂ = 1920L

As the tank will never be empty, the volume of the gas able to fill balloons is the total volume minus 12L, thus the volume of helium able to fill balloons is:

1920L - 12L = 1908L

1908L will fill:

1908L×\frac{1balloon}{3L} = <em>636 balloons</em>

<em></em>

I hope it helps!

7 0
4 years ago
Vanillin, c8h8o3 (m = 152 g/mol), is the molecule responsible for the vanilla flavor in food. how many oxygen atoms are present
Flauer [41]
Molecular weight of vanillin = 152 g/mol

Futher molecular formula of vanillin is C8H8O3

Atomic weight of oxygen = 16 g/mol

Thus, 152 g of vanillin contains 16 g of oxygen
∴   0.045 g  (45 mg) of vanillin contains \frac{16X0.045}{152} = 0.00473 g

Also, number of moles of vanillin in 0.045 g sample = \frac{weight}{molecular.weight} =  \frac{0.045}{152} = 2.96X10^{-4}
Now, 1  mole = 6.023 X 10^23 molecules
∴    2.96 X 10^-4 mole = 1.78 X 10^20 molecules

From molecular formula, it can be seen that 1 molecule of vanallin contain 3 atoms of oxygen
∴1.78 X 10^20 molecules contain 3 X 1.78 X 10^20 = 5.34 X 10^20 oxygen atoms
3 0
4 years ago
Consider the group 1A elements sodium (period 3), potassium (period 4), and rubidium (period 5). What would you predict about th
enyata [817]

The correct answer is Na > K > Rb.  

The order predicted would be ionization energy of sodium is greater than the ionization energy of potassium, which is greater than the ionization energy of rubidium.  

The ionization energy refers to energy, which has to be supplemented to a gaseous atom in order to withdraw an electron and produce a positive ion. The ionization energy decreases in going down a group. The cause of the decline of the ionization energy down a group is that as one moves down a group, the size of the atom increases that signifies that the valence electrons get further away from the nucleus, and thus, less energy is required to withdraw the electrons.  


4 0
3 years ago
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Which scientist developed the equation of wave mechanics?
NNADVOKAT [17]
It was Erwin Schrodinger. 
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