All categories

2 years ago

Which of the first 20 elements in a Periodic table has atoms with the greatest mass?

Chemistry

1 answer:

Rainbow [258]2 years ago

4 0

Calcium has the greatest mass of the first twenty elements with a mass of approximately 40.08

You might be interested in

Lewis is making a model of the Earth-Moon system. He knows that the diameter of the Earth is about four times greater than the d

Leno4ka [110]

D. this is the correct answer because the question is showing a comparison of sizes rather than the actual sizes which eliminates B. A and C have no relevance.

3 0

3 years ago

Read 2 more answers

A piece of copper has a mass of 660 g. How many atoms does the sample contain?

son4ous [18]

The conversions that will be used are:

1 mole of copper / 63.5 grams of copper
6.02 x 10²³ atoms of copper / 1 mole of copper

Multiplying the given mass by these conversions,

660 g * (1 mol Cu / 63.5 g Cu) * (6.02 x 10²³ Cu atoms / 1 mole Cu)

The sample contains 6.25 x 10²⁴ atoms of copper

4 0

3 years ago

Alveoli are tiny sacs of air in the lungs. Their average diameter is 4.50 × 10−5 m. Calculate the uncertainty in the velocity of

Arisa [49]

<u>Answer:</u> The uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

<u>Explanation:</u>

The diameter of the molecule will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $4.50\times 10^{-5}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of oxygen molecule = $5.30\times 10^{-26}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg}=4.424\times 10^{-5}m/s$

Hence, the uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

8 0

3 years ago

How many grams are of sodium chlorate are present in a 2.45 mole sample?

DedPeter [7]

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.

Explanation:

I hope this helps!!

4 0

3 years ago

Read 2 more answers

A brand of dish soap says that it will get your dishes cleaner. What is the

vodka [1.7K]

Answer:

Explanation:

Si no demuestra que funciona te estarían estafando

3 0

3 years ago

Which of the first 20 elements in a Periodic table has atoms with the greatest mass?​

Which of the first 20 elements in a Periodic table has atoms with the greatest mass?