A gas that extinguishes a flame is hydrogen. true or false

Answers

Answer 1

Answer:
This is true because it reacts with oxygen

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Which element in period 3 has both metallic and non metalik properties

Answers

Answer:

Siis the answer I hope this help

A solution of salt (molar mass 90 g mol-1) in water has a density of 1.29 g/mL. The concentration of the salt is 35% by mass.a. Calculate the molality of the solution.

b. Calculate the molarity of the solution.

c. Calculate the mole fraction of the salt in the solution.

Answers

The molarity of the solution is 5.018 mol/L and molality of the solution 5.9846 mol/kg.

Assume 100 g of solution the salt concentration- 35 % and water will be 65 %.

So,

mass of salt = 35 g

mass of water = 65 g

Number of moles,

$\bold {moles = \frac {mass} { molar\ mass}}$

So,

moles of salt = 35 g / 90 (g/mol) = 0.389 mole

moles of water = 65 / 18 = 3.6111 mole

Volume of solution,

$\bold {volume =\frac { mass } {density }}$

volume = 100 g / ( 1.29 g/ml)

volume of solution = 77.52 ml = 0.07752 L

$\bold {Molality = \frac {moles\ of \salt} { mass\ of\ water (kg)}}$

molality = 0.389 mol / 0.065 kg

molality = 5.9846 mol/kg

molarity = moles of salt / volume of solution (L)

molarity = 0.389 mol / 0.07752 L

molarity = 5.018 mol/L

mole fraction of salt = moles of salt / total moles

mole fraction of salt = 0.389 mol / ( 0.389 + 3.6111)

mole fraction of salt = 0.09725

To know more about Molarity,

brainly.com/question/12127540

Answer:

a) 5.9846 mol/kg

b) 5.018 mol/L

c)0.09725

Explanation:

consider 100 g of solution

now

since the salt is 35 % , water will be 65 %

now

mass of salt = 35 g

mass of water = 65 g

we know that

moles = mass / molar mass

moles of salt = 35 g / 90 (g/mol) = 0.389 mol

moles of water = 65 / 18 = 3.6111 mol

now

volume of solution = mass of solution / density of solution

volume of solution = 100 g / ( 1.29 g/ml)

volume of solution = 77.52 ml

volume of solution = 0.07752 L

a)molality = moles of salt / mass of water (kg)

molality = 0.389 mol / 0.065 kg

molality = 5.9846 mol/kg

molarity = moles of salt / volume of solution (L)

molarity = 0.389 mol / 0.07752 L

molarity = 5.018 mol/L

now

total moles in the solution = moles of salt + moles of water

total moles in the solution = 0.389 + 3.6111

total moles in the solution = 4 mol

now

mole fraction of salt = moles of salt / total moles

mole fraction of salt = 0.389 mol / 4 mol

mole fraction of salt = 0.09725

SELECT ALL THAT APPLYat STP conditions, 0.25 moles of CO2(g), H2(g), NH3(g)
1. Will contain the same number of molecules
2. Will contain the same number of atoms
3. Will occupy the same volume
4. Will have the same g.f.w

Answers

at STP conditions, 0.25 moles of CO2(g), H2(g), NH3(g)

The answers are:
1. Will contain the same number of molecules
3. Will occupy the same volume

Answer: The correct answer is Option 1 and Option 3.

Explanation:

We are given:

0.25 moles of $CO_2,H_2\text{ and }NH_3$

STP conditions states that 1 mole of a gas occupies 22.4 L of volume.

The volume occupied by all the gases at STP will be $0.25* 22.4=5.6L$

According to mole concept: 1 mole of a compound contains $6.022* 10^(23)$ number of molecules or 1 mole of an element contains $6.022* 10^(23)$ number of atoms.

We know that the given gases are compounds. Thus, all the three gases will have $0.25* 6.022* 10^(23)=1.5055* 10^(23)$ number of molecules.

Hence, the correct answer is Option 1 and Option 3.

How many moles of NO3 are there in 6.2g?

Answers

Answer : The number of moles of $NO_3$ is, 0.1 moles

Solution : Given,

Mass of $NO_3$ = 6.2 g

Molar mass of $NO_3$ = 62 g/mole

Now we have to calculate the moles of $NO_3$ .

$\text{Moles of }NO_3=\frac{\text{Mass of }NO_3}{\text{Molar mass of }NO_3}=(6.2g)/(62g/mole)=0.1moles$

Therefore, the number of moles of $NO_3$ present in 6.2 g is, 0.1 moles

6.2 divided by the mass number of NO3 is 0.1 moles. Anytime your trying to find the moles of something you divide it by the mass number of your combined elements.

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. What other characteristic does the radiation have?some shielding required
no mass
large mass
high penetrating power

Answers

The radiation emitted is a beta particle with a -1 charge. Beta particles have a medium penetrating power. An emission of beta particles requires shielding because of the hazards it pose to humans. Thus, one characteristic of this radiation is that some shielding is required.

Answer: A) Some shielding required

Explanation:

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How are mixtures compounds and elements alike?

Answers

elements make up compounds, and when 2 or more compounds are chemically combined it makes a mixture or they are all matter, they have mass and occupy space

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