What is the mass in grams of 2.00 10 5 atoms of naturally occurring neon

As an instructor is preparing for an experiment, he requires 225 g phosphoric acid. The only container readily available is a 15

Kamila [148]

Answer:

Yes, the 150-mL Erlenmeyer will be large enough to contain the acid.

Explanation:

As an instructor is preparing for an experiment, he requires 225 g phosphoric acid. Considering that the density of the phosphoric acid is 1.83 g/mL, we can find the volume occupied by the acid using the following expression.

density = mass / volume

volume = mass / density

volume = 225 g / (1.83 g/mL)

volume = 123 mL

The phosphoric acid occupies 123 mL so the 150-mL Erlenmeyer will be large enough to contain it.

6 0

3 years ago

What would you that the test is positive

Komok [63]

1_____________________________________________

5 0

3 years ago

How many moles of hydrogen gas are needed to produce 20 grams of hydrochloric acid (HCl)?

Charra [1.4K]

Answer:

0.27 mole

Explanation:

Data given:

mass of hydrochloric acid (HCl) = 20 g

moles of hydrogen (H₂O) = ?

Solution:

First we look to the reaction in which hydrogen react with Chlorine and make hydrochloric acid (HCl)

Reaction:

H₂ + Cl₂ -----------> 2HCl

Now look at the reaction for mole ratio

H₂ + Cl₂ -----------> 2HCl

1 mole 2 mole

So it is 1:2 mole ratio of hydrogen to hydrochloric acid (HCl)

As we Know

molar mass of H₂ = 2(1) = 2 g/mol

molar mass of HCl = 1 + 35.5 = 36.5 g/mol

Now convert moles to gram

H₂ + Cl₂ -----------> 2HCl

1 mole (2 g/mol) 2 mole (36.5 g/mol)

2 g 73 g

So,

we come to know that 2 g of hydrogen gives 73 g of hydrochloric acid (HCl) then how many grams of hydrogen will be required to produce 20 grams of hydrochloric acid (HCl).

Apply unity formula

2 g of H₂ ≅ 73 g of HCl

X g of H₂ ≅ 20 g of HCl

Do cross multiplication

X of H₂ = 2 g x 20 g / 73 g

X of H₂ = 0.55 g

Now convert grams of H₂ into moles

No. of moles = mass in grams/molar mass

Put values in above formula

No. of moles = 0.55 g / 2 (g/mol)

No. of moles = 0.27 mol

0.27 mole of hydrogen needed to produce 20 gram of hydrochloric acid (HCl).

7 0

3 years ago

Suppose two 200.0-L tanks are to be filled separately with the gases helium and hydrogen. What mass of each gas is needed to pro

Aneli [31]

Answer:

Mass of helium = 4426.9524 g

Mass of hydrogen gas = 2213.4762 g

Explanation:

Pressure = 135 atm

Temperature = 24 °C

Volume = 200 L

Number of moles = ?

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T₁ = (24 + 273.15) K = 297.15 K

Using ideal gas equation as:

PV=nRT

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

135 atm × 200 L = n × 0.0821 L.atm/K.mol × 297.15 K

⇒n = 1106.7381 moles

<u>For helium gas:</u>

Molar mass = 4 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$1106.7381= \frac{Mass}{4}$

$Mass= 4426.9524\ g$

<u>For hydrogen gas:</u>

Molar mass = 2 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$1106.7381= \frac{Mass}{2}$

$Mass= 2213.4762\ g$

4 0

3 years ago

What is the effect of a catalyst on a reaction? It increases the entropy. It decreases the entropy. It changes the equilibrium.

Leto [7]

Answer: It increases the entropy

Explanation:

Entropy is the measure of degree of randomness or disorder.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products. Thus leading to more randomness and more entropy.

4 0

3 years ago