All categories

3 years ago

How many atoms are there in 2.43 g of calcium?

Chemistry

1 answer:

Evgen [1.6K]3 years ago

3 0

Answer:

Explanation:

We're asked to calculate the number of atoms of

153

g Ca

What we must first do is convert the given mass of calcium to moles of calcium, using its molar mass (referring to a periodic table, this is

40.08

mol

153

g Ca

(

mol Ca

40.08

g Ca

)

3.82

mol Ca

Using Avogadro's number,

6.022

particles

mol

, we can calculate the number of atoms present:

3.82

mol Ca

(

6.022

atoms Ca

mol Ca

)

2.30

atoms Ca

You might be interested in

Look up the active ingredient in baking soda. Write a molecular and net ionic equation when that active ingredient is mixed with

Volgvan

Answer:

The active ingredients in baking soda (NaHCO3) are

$Na^+$ and $HCO3^-$

when Baking soda reacts with Acetic acid

Molecular equation

NaHCO3(aq) + CH3COOH(aq) → Na(CH3COO)(aq) + CO2(g) +H2O(l)

Ionic equation

$Na^+ + HCO3^- + CH3COOH$ → $Na^+ + CH3COO^- +CO2 + H2O$

as $Na^+$ is present on both sides so it will cancel out and the net ionic equation will be

$HCO3^-(aq) + CH3COOH(aq)$ → $CH3COO^-(aq) + CO2(g) + H2O(l)$

6 0

3 years ago

Which of these scientist is know for his work in understanding climate change a : edwin hubble b : christian doppler c : warren

Airida [17]

I would say Edwin Hubble

8 0

3 years ago

an element has atomic number 10 and an atomic number mass of 20. How mamy neutrons are in the atom of this element?

lesya692 [45]

Answer:

Explanation:

The atomic mass = 20

The atomic number = 10

The number of neutrons = mass - number = 20 - 10 = 10

This formula is always true. There are no exceptions.

8 0

3 years ago

Anyone know how to get into Dexters secret laboratory

DanielleElmas [232]

Yes just like the take the elevator

4 0

2 years ago

Read 2 more answers

Of an 8 M solution of HCI, 1 L is diluted to 2 M. What is the volume of the diluted<br> solution?

jok3333 [9.3K]

Answer: The volume of diluted solution is 4 L

Explanation:

According to the dilution law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of stock $HCl$ solution = 8 M

$V_1$ = volume of stock $HCl$ solution = 1 L

$M_1$ = molarity of diluted $HCl$ solution = 2 M

$V_1$ = volume of diluted $HCl$ solution = ?

Putting in the values we get:

$8M\times 1L=2M\times V_2$

$V_2=4L$

Therefore, volume of diluted solution is 4 L

4 0

3 years ago