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3 years ago

Hi;) this is easy i just need someone to explain it to me

Chemistry

1 answer:

BigorU [14]3 years ago

4 0

Answer:

Explanation:

A Gamma rays is the best wavelength for an astronomer to use to study the composition of planets and stars

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80 protons, 119 neutron

g100num [7]

Mercury-199 is composed of 80 protons, 119 neutrons, and 80 electrons.

4 0

3 years ago

How many molecules are in 3.40 mol He?

shutvik [7]

Answer:

20.5 × 10²³ molecules of He

Explanation:

Given data:

Number of moles of He = 3.40 mol

Number of molecules of He = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 3.40 moles of He:

3.40 mol × 6.022 × 10²³ molecules

20.5 × 10²³ molecules of He

8 0

4 years ago

The strongest substance in your body is:

Sholpan [36]

The enamel is the strongest substance in our bodies mainly inside your mouth.

3 0

4 years ago

Word equation for <br> Zn + 2HCI - ZnCl2 + H2

Alborosie

Answer:

zinc reacts with 2 moles of hydrochloric acid to produce two moles of zinc(ii) chloride and hydrogen gas

Explanation:

please like and Mark as brainliest

7 0

4 years ago

Write 0.006 in exponential form

Solnce55 [7]

$\huge\pink{Answer}$

0.0006 in scientific notation is 6 × 10-4

<h2>Step by step Explanation:</h2>

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0006 into scientific notation, follow these steps:

Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -4

Write in the scientific notation form m × 10n

= 6 × 10-4

Therefore,

6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006

<h2>HOPE IT HELPS ☺️</h2>

7 0

4 years ago