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3 years ago

The semi-conductors on the periodic table are classified as

Chemistry

1 answer:

Mila [183]3 years ago

4 0

Most likely the transition metals

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What is the mass of 4.85 X 10^22 atoms of iron (Fe)?

ludmilkaskok [199]

Answer:

Mass = 4.5 g

Explanation:

Given data:

Number of atoms of iron = 4.85 ×10²² atoms

Mass of iron = ?

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,

4.85 × 10²² atoms of iron / 6.022 × 10²³ atoms × 1 mol

0.081 mol

Mass of iron:

Mass = number of moles × molar mass

Mass = 0.081 mol × 55.85 g/mol

Mass = 4.5 g

8 0

3 years ago

Which of the following describes a crystal? *

Lynna [10]

Answer:

has a highly ordered microscopic structure

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3 years ago

Controls are defined as____

Alexeev081 [22]

A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable.

5 0

4 years ago

Balance the following equations:

Ganezh [65]

Answer:

50CuS2 + 260HNO3 = 50Cu(NO3)2 + 100H2SO4 + 80N2O + 3H2O

Explanation:

5 0

3 years ago

Convert the MCL of antimony from milligrams per liter to parts per billion (ppb).

Aleks [24]

This is an incomplete question, here is a complete question.

According to the EPA, the maximum contaminant level (MCL) of antimony in drinking water is 0.0060 mg/L.

Convert the MCL of antimony from milligrams per liter to parts per billion (ppb).

Answer : The maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb

Explanation :

ppb : It is defined as the mass of solute present in per 1000 million $(10^{-9}g)$ of total mass.

1 ppb = $\frac{10^{-9}g\text{ of solute}}{1g\text{ of solution}}$

As we know that:

1 milligrams per liter = 1000 parts per billion

or,

1 mg/L = 1000 ppb

As, 1 mg/L = 1000 ppb

So, 0.0060 mg/L = $\frac{0.0060mg/L}{1mg/L}\times 1000\text{ ppb}$

= 6 ppb

Thus, the maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb

6 0

3 years ago