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3 years ago

What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass number of 39

Chemistry

1 answer:

zvonat [6]3 years ago

7 0

Answer:

NO OF NEUTRON =MASS NO -ATOMIC NO

=39-19

=20

bcz atomic no is equal to no of electrons

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When an object is thrown, the thrower pushes the object. This causes the object to move in a

bija089 [108]

Answer:

Gains Kinetic Energy

Explanation:

Kinetic energy (KE) is the energy inserted on the object in motion. Having gained this energy enerted upon, the body maintains this kinetic energy unless its speed changes.

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3 years ago

Help for Number 5 please.

pshichka [43]

What subject is this ?

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3 years ago

Calculate the mass of vanadium(V) oxide (V2O5) that contains a million (1.0 *10^6) vanadium atoms. Be sure your answer has a uni

sweet [91]

Answer : The mass of vanadium(V) oxide will be $1.51\times 10^{-16}g$

Explanation : Given,

Number of atoms of $V_2O_5$ = $1.0\times 10^{6}$

Molar mass of $V_2O_5$ = 181.88 g/mole

In $V_2O_5$ , there are 2 atoms of vanadium and 5 atoms of oxygen.

First we have to determine the moles of $V_2O_5$ .

As, $2\times 6.022\times 10^{23}$ number of vanadium atom present in 1 moles of $V_2O_5$

So, $1.0\times 10^{6}$ number of vanadium atom present in $\frac{1.0\times 10^{6}}{2\times 6.022\times 10^{23}}=8.3\times 10^{-19}$ moles of $V_2O_5$

Now we have to determine the mass of $V_2O_5$ .

$\text{Mass of }V_2O_5=\text{Moles of }V_2O_5\times \text{Molar mass of }V_2O_5$

$\text{Mass of }V_2O_5=(8.3\times 10^{-19}mole)\times (181.88g/mole)=1.51\times 10^{-16}g$

Therefore, the mass of vanadium(V) oxide will be $1.51\times 10^{-16}g$

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4 years ago

Read 2 more answers

ANDRES MEJIA-C...

BigorU [14]

Explanation:

Gases: more space therefore meaning that particles in the gas have the highest Kinetic energy therefore moving faster all around.

Liquid: they have more kinetic energy than liquid,but they have some space for movement so they collide each other quicker due to lack of space.

solids: They have least kinetic energy as they have no space at all meaning particles can move around and only just vibrate against each other.

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3 years ago

How does a barometer predict the weather?

Lunna [17]

Answer:

Barometers measure this pressure. ... Changes in the atmosphere, including changes in air pressure, affect the weather. Meteorologists use barometers to predict short-term changes in the weather. A rapid drop in atmospheric pressure means that a low-pressure system is arriving.

Explanation:

<h3>I hope this helps!</h3>

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3 years ago