How many moles are in 13.5g of calcium?

Chemistry

1 answer:

antiseptic1488 [7]3 years ago

3 0

Answer:

=0.337mol Ca this is the correct answer :)

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If 3.50 g of the unknown compound contained 0.117 mol of c and 0.233 mol of h, how many moles of oxygen, o, were in the sample?

makvit [3.9K]

To determine the amount of oxygen that is present in the compound, we have to assume that the given compound contains carbon, hydrogen and oxygen only or else we will not be able to determine the answer. We need to convert the moles of the elements given to units of grams by using the atomic mass of these elements. Then, from the total amount of the compound we subtract the masses of the elements. We do as follows:

mass
0.117 mol C ( 12.01 g / 1 mol ) = 1.41 g
0.233 mol H ( 1.01 g / 1 mol ) = 0.24 g

Mass O = 3.50 g - 1.41 g - 0.24 g = 1.85 g O
Moles O = 1.85 g O ( 1 mol / 16 g ) = 0.116 moles O

6 0

3 years ago

The N H 2 group makes the molecule an amine. Like alcohols, amines can participate in hydrogen bonding. If the drawn molecule en

lesantik [10]

Answer:

a hydrogen bond between the hydrogen of water and the nitrogen of the amine

a hydrogen bond between the oxygen of water and a hydrogen from the -NH2 group

Explanation:

A hydrogen bond is formed between molecules in which hydrogen is bonded to a highly electronegative element.

In amines, hydrogen is bonded to nitrogen while in water, hydrogen is bonded to oxygen. Both are highly electronegative elements hence hydrogen bonding is possible between amines and water.

This hydrogen bond may involve;

The hydrogen of water and the nitrogen of the amine

The oxygen of water and a hydrogen from the -NH2 group

7 0

3 years ago

⇔what process occurs in some cells

Serhud [2]

It could be a couple different thing, explain more.<span />

3 0

3 years ago

A sample of argon gas at stp occupies 56.2 liters. determine the number of moles of argon and the mass in the sample. for the ab

andreev551 [17]

We can use the ideal gas law equation to find the number of moles;
PV = nRT
where P - pressure
V - volume - 56.2 x 10⁻³ m³
n - number of moles
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature
standard temperature is 273 K
and standard pressure - 101 325 Pa
we can rearrange the equation to find the number of moles
$n = \frac{PV}{RT}$
substituting the values in the equation
$n = \frac{101325Pa*56.2 x 10⁻³ m³}{8.314 Jmol⁻¹K⁻¹*273K}$
n = 2.51 mol
molar mass of Ar - 40 g/mol
mass of Ar in the sample - 2.51 mol x 40 g/mol = 100.4 g

7 0

4 years ago

Which term describes energy stored in the bonds between atoms?

horsena [70]

Answer:

B.) Chemical

Explanation:

The energy stored in the bonds between atoms is referred to as chemical energy. I hope this helps! ^-^

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3 years ago