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3 years ago

What is the number of protons and electrons in a neutral atom of Lithium?

Chemistry

1 answer:

nadya68 [22]3 years ago

3 0

If you look at the periodic table you will see the atomic number (the smaller number) which is 3. that identifies how many protons there are. since the lithium is neutral that means there’s a same amount of electrons.

therefore there’s 3 electrons and 3 protons

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A sample of neon occupies a volume of 752 ml at 25 0

lyudmila [28]

$V_{initial} = 752\:mL$
$T_{initial} = 25.0^0C$
converting to Kelvin
TK = TC + 273
TK = 25.0 + 273 → TK = 298.0 → $T_{initial} = 298.0\:K$
$V_{final} = ? (in\:milliliters)$
$T_{final} = 50.0^0C$
TK = TC + 273
TK = 50.0 + 273 → TK = 323.0 → $T_{final} = 323.0\:K$

By the first Law of Charles and Gay-Lussac, we have:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$

Solving:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$
$\frac{ 752 }{ 298.0 } = \frac{ V_{f} }{ 323.0 }$
Product of extremes equals product of means:
$298.0* V_{f} = 752*323.0$
$298.0 V_{f} = 242896$
$V_{f} = \frac{242896}{298.0}$
$\boxed{\boxed{V_{f} \approx 815.08\:mL}}\end{array}}\qquad\quad\checkmark$

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4 years ago

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Alekssandra [29.7K]

Answer:

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If a non-cyclic alkane shows a molecular ion peak at m/z 3.80 × 102, what is the chemical formula?

soldier1979 [14.2K]

The General Equation of Alkane is as follow,

CnH₂n₊₂ ------- (1)
As m/z = 380
So,
CnH₂n₊₂ = 380
Or,
12n+ 1₂n₊₂ = 380

12n+ ₂n ₊ ₂ = 380

14n ₊ ₂ = 380

14n = 380 - 2

14n = 378

n = 378 / 14

n = 27
Now, putting value of n in eq. 1

C₂₇H₍₂₇ₓ₂₎₊₂

C₂₇H₅₆
Result:
n = C = 27

y = H = 56

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