How many gram-atoms are in 120-gram sample of calcium metal? How many atoms is this?

1 answer:

3 0

(sample g/1) X (1 mole/40.078(MW of Ca)) = moles of sample (moles of sample)(6.022 x 10^23( no of atoms)/ 1 mole) = # of atoms in a 120 g sample of calcium Avogadro's number=6.022x 10^23 atoms in 1 mole

You might be interested in

What is the substance? cdH) (Η) (Η (H)C cco Ή) (Η Η Η

BabaBlast [244]

Doing it for the bag

4 0

2 years ago

Jupiter, Saturn, Uranus, and Neptune are a known as ____.

neonofarm [45]

The outer planets of the solar system that are known as Gas Giants

4 0

3 years ago

Sulfur dioxide, SO2(g), can react with oxygen to produce sulfur trioxide, SO3(g), by the following reaction

WITCHER [35]

Answer:

The heat produced is -15,1kJ

Explanation:

For the reaction:

2SO₂+O₂ → 2SO₃

The enthalpy of reaction is:

ΔHr = 2ΔHf SO₃ - 2ΔHf SO₂

As ΔHf SO₃ = -395,7kJ and ΔHf SO₂ = -296,8kJ

ΔHr = -197,8kJ

Using n=PV/RT, the moles of reaction are:

$n = \frac{1,00atm*3,75L}{0,082atmL/molK*298,15K}$ = 0,153 moles of reaction

As 2 moles of reaction produce -197,8kJ of heat, 0,153moles produce:

0,153mol× $\frac{-197,8kJ}{2mol}$ = -15,1kJ

I hope it helps!

8 0

2 years ago

What is a caliper used for

photoshop1234 [79]

To measure the distance between two opposite sides of an object

8 0

3 years ago

Which electrophiles can react with an enol?

dlinn [17]

THE MOLECULE HAS A C=C AND AN -OH GROUP, SO IT IS CALLED AN ENE/OL, I.E., AN ENOL. ENOLS CAN BE FORMED ONLY FROM CARBONYL COMPOUNDS WHICH HAVE ALPHA HYDROGENS. THEY CAN BE FORMED BY ACID OR BASE CATALYSIS, AND ONCE FORMED ARE HIGHLY REACTIVE TOWARD ELECTROPHILES, LIKE BROMINE.

8 0

2 years ago