Methane is a gas that easily catches fire. This statement is describing a ____

Tia has a sample of pure gold (Au). She weighed the sample and the result was 35.9 grams. Tia wants to determine the number of a

Gemiola [76]

First, find moles of gold given the mass of the sample:
(35.9g Au)/(197.0g/mol Au) = 0.182mol Au

Second, multiply moles of Au by Avogrado's number:
(0.182mol)(6.02 x10^23)= 1.10x10^23 atoms Au

4 0

3 years ago

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During an experiment, Sandy recorded incorrect observations and measurements. What would be the most

ruslelena [56]

Sandy would reach an incorrect outcome.that's because she will repeat this mistake in the future too.

3 0

3 years ago

One of the first steps toward currently accepted theories of our Solar System's formation and evolution was the general acceptan

iragen [17]

The first blank can be filled with the Heliocentric model, and the second blank can be filled with Copernicus.

The heliocentric model known as heliocentrism was proposed by the Renaissance astronomer, mathematician, and the Catholic cleric Nicolaus Copernicus resulting in the Copernican revolution.

It is the astronomical model, in which the planets and the Earth revolve around the Sun positioned at the middle of the Solar system. Factually, the heliocentric model was in contrast to geocentrism, in which Earth is positioned at the center of the Solar system.

6 0

3 years ago

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a metal worker uses a cutting torch that operates by reacting acetylene gas, C2H2(g), with oxygen gas, O2(g), as shown in the un

harkovskaia [24]

Answer:

650 grams

Explanation:

Given that acetylene gas reacts with oxygen to produce caobon dioxide, water and heat and the unbalnced equation is

$C_2H_2(g)+O_2(g) \rightarrow CO_2(g) + H_2O(g)+ heat$

Gram-formula mass of $C_2H_2= 26$ g/mol

So, mass of 1 mole of acelylene is 26 grams

Therefore, mass of 25 moles of acelylene=25x26=650 grams

Hence, the mass of 25 moles of acelylene is 650 grams

8 0

2 years ago

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Which of the following steps correctly describes the preparation of 0.5 M solution of FeCl3?

Marizza181 [45]

Answer:

Option A is correct

Explanation:

Data given:

Steps for preparation of 0.5 M solution = ?

Solution:

Molarity: This the term used for the concentration of the solution. It is the amount of solute in moles dissolve in 1 Liter of solution.

Formula used for Molarity

Molarity = number of moles of solute / 1 L of solution

From the above definition and formula it is clear that we have to know the following things.

no. of moles of f the solute

we also should know that of what concentration we are preparing solution in terms of molarity
The total amount of should be in liter of solution not solvent separately

Now:

As we couldn't weight mole on balance so have to convert moles to grams by using molar mass or mass in grams formula

As

1 mole = mass in grams / molar mass

so to convert mole to mass rearrange the above equation

mass in grams = 1 mole x molar mass

So,

1 mole of any substance equal to its molar mass

Now, to prepare 0.5 M solution of FeCl₃

First we find molar mass and weigh it

So,

1 mole of FeCl₃ = molar mass of FeCl₃

for 0.5 M

Multiply the molar mass with 0.5

To make 1 L of solution

As we know that molarity is the amount of solution in liter of solution not solvent, so we add the calculated amount of solute in volumetric flask and then add water till the 1 L mark. that is amount of solute plus solvent combined form 1 L of Solution.

So, Option A is correct: Find the molar mass of FeCl3 and multiply by 0.5 to find the amount. Add this amount in a volumetric flask and add water till the 1 L mark

3 0

3 years ago

Methane is a gas that easily catches fire. This statement is describing a _____.