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JulsSmile [24]
3 years ago
9

An atom has 20 protons, 26 neutrons, and 20 electrons. what could be the atomic mass of this atom?

Chemistry
1 answer:
Elanso [62]3 years ago
7 0
46 is the answer. because if you add 26 and 20 that is the mass
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Solid potassium fluoride decomposes into fluorine gas and solid potassium .
inna [77]
2KF(s) -----> 2K(s)+F2(g)
8 0
3 years ago
What is the volume of a balloon containing 0.75 moles of gas at STP?
disa [49]

Answer:

V = 16.81 L

Explanation:

Given data:

Number of moles = 0.75 mol

Temperature = standard = 273 K

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Volume of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will rearrange the formula.

V = nRT/P

V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm

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6 0
3 years ago
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rosijanka [135]

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5 0
3 years ago
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Sphinxa [80]

Answer:

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3 0
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Which of the following is NOT a symbol for an element? H Li Pb HF
sp2606 [1]
HF because an element is always a capital then a lowercase letter
3 0
4 years ago
Read 2 more answers
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