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Airida [17]
3 years ago
9

Nitrogen has a density of 1.17 x 10^-3 g/cm^3. If you have 2,500 cm^3 of nitrogen gas, which of the following is the correct mas

s of nitrogen, using significant figures?
A. 2.92 g

B. 2.2 x 10^6g

C. 14 x 10^6g

D. 2.9 g
Chemistry
2 answers:
ELEN [110]3 years ago
8 0
I think the correct answer from the choices listed above is option D. The correct mass of nitrogen would be 2.9 g. The mass is calculated by multiplying the density and the volume of the substance. The correct answer should have two significant figures since it is the least precise operation.
8090 [49]3 years ago
7 0

Answer : The correct option is, (A) 2.92 g

Explanation :

Density : It is defined as the mass of a substance contained per unit volume.

Formula used :

Density=\frac{Mass}{Volume}

Given :

Density of nitrogen gas = 1.17\times 10^{-3}g/cm^3

Volume of nitrogen gas = 2500cm^3

Now we have to determine the mass of nitrogen gas.

By using formula, we get:

1.17\times 10^{-3}g/cm^3=\frac{Mass}{2500cm^3}

Mass=2.92g

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

In this problem, the least number of significant figures is 3. So, the answer will be in 3 significant figures.

Therefore, the mass of nitrogen gas is 2.92 grams

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One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
Rudiy27

Answer:

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Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

M_2O+H_2 \rightarrow 2M+H_2O

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

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Thus, we perform the operations in order to obtain:

\frac{10x}{2x+16}=2.32

So we solve for x as shown below:

10x = 2.32(2x+16)\\\\10x = 4.64x+37.12\\\\x = \frac{37.12}{10-4.64}\\\\x= 6.93 g/mol

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

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Answer:

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