How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
a
70 neutrons, 75 protons, 50 electrons
b
120 neutrons, 50 protons, 75 electrons
c
50

protons, 50 electrons, 75 neutrons
d
75 electrons, 50 protons, 50 neutrons

50 protons, 50 Electrons and 75 Neutrons.
The Atomic number is the number of protons in the nucleus of an atom, while the mass number is the sum of the protons plus the neutrons. [ The electrons have near 0 mass so they don't add up to the mass number and unless the atom is an isotope, the number of protons is always equal to those of electrons. ]

Expert answered|wisbest|Points 1806|

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Asked 2/8/2013 4:16:49 PM

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If 20.0 grams of Ca combines completely with 16.0 grams of S to form a compound, what is the percent composition of Ca in the compound?
a
1.25%
b
20.0%
c
44.4%
d
55.6%
**Weegy:** 44.4% is the percent composition of S in the compound. **User:** If 20.0 grams of Ca combines completely with 16.0 grams of S to form a compound, what is the percent composition of Ca in the compound? **Weegy:** The total mass of the compound is 20 + 16 g, or 36 g.
Of that 36 g, 20 is Ca. [ So the fraction of Ca is 20 / 36.
To change that to % multiply by 100, so..
% Ca is 20 / 36 X 100% or 55.555555%
( ] (More)

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Asked 2/1/2013 11:23:09 PM

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The lowest whole-number ratio of the elements in a compound is called the
a
empirical formula
b
molecular formula
c
binary formula
d
representative formula
**Weegy:** C. empirical formula **User:** What is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight?
A) C3HN2
B) C4H14N2
C) C2H7N
D) CH4N7 **Weegy:** Empirical formula: C2H7N **User:** Which of the following is NOT true about empirical and molecular formulas?
a
The molecular formula of a compound can be the same as its empirical formula.
b
The molecular formula of a compound can be some whole-number multiple of its empirical formula.
c
Several compounds can have the same empirical formula, but have different molecular formulas.
d
The empirical formula of a compound can be triple its molecular formula. (More)

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Asked 2/1/2013 11:31:49 PM

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Which of the following compounds has the lowest percent gold content by weight?
A) AuOH
B) Au(OH)3
C) AuCl3
D) AuI3 **Weegy:** compounds has the lowest percent gold content by weight: D) AuI3
molar mass AuOH = 213.997 g/mol
% Au = 196.97 x 100 / 213.997 = 92.1
molar mass Au(OH)3 = 247.99 g/mol
% Au = 196.97 x 100 / 247.99=79.4
molar mass AuCl3 = 303.329 g/mol
% Au = [ 196.97 x 100/ 303.329=64.9
molar mass AuI3 = 577.682 g/mol
% Au = 196.97 x 100 / 577.682 =34.1 ] **User:** Which of the following compounds have the same empirical formula?
A) CO2 and SO2
B) C7H14 and C10H20
C) C4H10 and C10H4
D) C6H12 and C6H14 (More)

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Asked 2/1/2013 11:28:03 PM

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Write the slope intercept form of the equation of the line that passes through (-2, -3) and (2, -5).
a
y = -2x - 7
b
y = 1/2x + 4
c
y = -1/2x - 4
d
y = -2x + 1

Question

Not Answered

Updated 94 days ago|9/16/2014 7:50:10 AM

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y = -1/2x - 4 is the equation that writes in the slope intercept form of the equation of the line that passes through (-2, -3) and (2, -5 ) .

Added 94 days ago|9/16/2014 7:44:39 AM

Find the slope of the line x = -3.
a
-3
b
0
c
3
d
undefined
User: Find the slope of the line x = -3.
a
-3
b
0
c
3
d
undefined
**Weegy:** Undefined slope is when the line is vertical, and the slope is infinite (technically). Any y value is irrelevant in this kind of line, so in slope intercept, the equation is x = -3. [ Putting it in standard form, you get x + 3 = 0 The answer is x + 3 = 0. I hope this is helpful. :) ] **User:** Write an equation of the line that passes through (10,-4) and is perpendicular to the line whose equation is y = 2/5x - 8.
a
y = 2/5x - 8
b
y = 2/5x + 58/5
c
y = -5/2x + 21
d
y = -5/2x - 29
**Weegy:** y = -5/2x - 29 (More)

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Asked 2/2/2013 9:36:24 PM

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