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3 years ago

-HELP-How many molecules are contained in 125 grams of oxygen gas (O2)?

Chemistry

1 answer:

strojnjashka [21]3 years ago

3 0

Answer:

62.50

Explanation:

I divided the 125 in the result is 62.50 but it is considered a 62.

never mine:)

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Read the summary below. Choose the answer that BEST fits into the blank to complete the summary.

777dan777 [17]

Answer:

An atom has a nucleus, made up protons and neutrons, which is surrounded by a cloud of electrons.

Explanation:

An atom is the smallest indivisible part of any element that takes place in a chemical reactions.

These are the fundamental building blocks of every element and even compounds.

There are three known subatomic particles found within an atom.
Electrons are the negatively charged particles in an atom
Protons are the positively charged particles of an atom
Neutrons do not carry any charges.

Both protons and neutrons are located within the tiny space called nucleus at the center of an atom.

Electrons moves round in orbitals at the spaces outside of the nucleus.

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3 years ago

What is acid precipitation?

zimovet [89]

Explanation:

precipitation like snow rain with increased acid is know as acid precipitation

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3 years ago

Two 0.75 Amp loads are connected in parallel with a 2500 Milliamperehour Ni-Cd battery. Approximately how long can the battery p

nikdorinn [45]

Explanation:

It is given that two loads have 0.75 Ampere current each. And, they contain 2500 milli ampere per hour Ni-Cd battery.

As both the loads are connected in parallel. Hence, total current will be calculated as follows.

I = $I_{1} + I_{2}$

= 0.75 A + 0.75 A

= 1.5 A

= $1.5 A \times \frac{1000 mA}{1 A}$

= 1500 mA

Relation between time and capacity of battery is as follows.

Capacity = Current × time (in hour)

therefore, time = $\frac{Capacity}{Current}$

= $\frac{2500 mA. h}{1500 A}$

= 1.667 hr

Thus, we can conclude that the battery provide power to the load up to 1.667 hours.

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4 years ago

An electron is moving northward in a magnetic field. the magnetic force on the electron is toward the northeast. what is the dir

sweet-ann [11.9K]

The direction of the magnetic field would be going up.

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3 years ago

A chemist adds 485 mL of a 0.0025 mol/L calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sul

viva [34]

Answer : The mass in grams of calcium sulfate is 0.16 grams.

Explanation :

Molarity : It is defined as the number of moles of solute present in one litre of solution.

Formula used :

$Molarity=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution}}$

Solute is, $CaSO_4$

Given:

Molarity of $CaSO_4$ = 0.0025 mol/L

Molar mass of $CaSO_4$ = 136 g/mole

Volume of solution = 485 mL

Now put all the given values in the above formula, we get:

$0.0025=\frac{\text{Mass of }CaSO_4\times 1000}{136\times 485}$

$\text{Mass of }CaSO_4=0.16g$

Thus, the mass in grams of calcium sulfate is 0.16 grams.

6 0

3 years ago