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2 years ago

1. A chemical equation is balanced when *

Chemistry

2 answers:

wel2 years ago

7 0

Answer:

If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced.

lubasha [3.4K]2 years ago

6 0

Answer:1 Answer. A chemical equation is balanced when the number of each kind of atom is the same on both sides of the reaction,,

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Hi guys I need an science matter experiment to do at school. For example which chocolate is best to take at a hot climate? Dark,

inysia [295]

Dark is the strongest chocolate.

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2 years ago

Select the correct statement to describe when a sample of liquid water vaporizes into water vapor.

UNO [17]

The answer is a am sure

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3 years ago

An elemental analysis is performed in an unknown compound. It is found to contain 40.0 % mass in Carbon, 6.71% mass in Hydrogen,

DENIUS [597]

Answer: Molecular formula will be $C_3H_6O_3$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C= 40 g

Mass of H = 6.71 g

Mass of O = 100 - (40+6.71 ) = 53.29 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{40g}{12g/mole}=3.33moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{6.71g}{1g/mole}=6.71moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{53.29g}{16g/mole}=3.33moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{3.33}{3.33}=1$

For H = $\frac{6.71}{3.33}=2$

For O = $\frac{3.33}{3.33}=1$

The ratio of C: H: O= 1 : 2: 1

Hence the empirical formula is $CH_2O$

The empirical weight of $CH_2O$ = 1(12)+2(1)+1(16)= 30g.

The molecular weight = 90.08 g/mole

Now we have to calculate the molecular formula:

$n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{90.08}{30}=3$

The molecular formula will be= $3\times CH_2O=C_3H_6O_3$

Molecular formula will be $C_3H_6O_3$

6 0

2 years ago

What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 5.0 cm 3 ?

Georgia [21]

Answer:

5.0g/cm^3

Explanation:

Since we have the mass of the wood (25.0g) and the volume of the wood (5.0cm^3), can use the formula for density to answer this question.

Density=mass/density

Density=25.0g/5.0cm^3

Density=5.0g/cm^3

Therefore, the density of the piece of wood is 5.0g/cm^3.

I hope this helps!

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2 years ago

The simplest formula for a compound made from element x this 21 nitrogen by mass is

irina [24]

The simplest formula for a compound made from element x which is molar mass is equals to 79.0 g/mol that is 21% nitrogen by mass is X sub 2 N sub 3. In addition, X is equals to 79.0 and N is equals to 14.

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3 years ago