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4 years ago

2. A student wishes to find the density of an irregularly shaped rock. He finds the mass to be 12.34

Chemistry

1 answer:

lukranit [14]4 years ago

7 0

Answer:

The answer is

Explanation:

The Density of a substance can be found by using the formula

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

From the question

mass of rock = 12.34 g

volume = final volume of water - initial volume of water

volume = 54.5 mL - 50 mL = 4.5 mL

So the density is

$density = \frac{12.34}{4.5} \\ = 2.744444444...$

We have the final answer as

Hope this helps you

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A sample of oxygen gas at a pressure of 1.19 atm and a temperature of 24.4 °C, occupies a volume of 18.7 liters. If the gas is a

mihalych1998 [28]

Answer:

$\boxed {\boxed {\sf 0.757 \ atm}}$

Explanation:

We are asked to find the pressure of a gas given a change in volume. Since the temperature remains constant, we are only concerned with volume and pressure. We will use Boyle's Law, which states the volume is inversely proportional to the pressure. The formula for this law is:

$P_1V_1= P_2V_2$

Initially, the oxygen gas occupies a volume of 18.7 liters at a pressure of 1.19 atmospheres.

$1.19 \ atm * 18.7 \ L = P_2V_2$

The gas expands to a volume of 29.4 liters, but the pressure is unknown.

$1.19 \ atm * 18.7 \ L = P_2 * 29.4 \ L$

We are solving for the new pressure, so we must isolate the variable $P_2$ . It is being multiplied by 29.4 liters. The inverse operation of multiplication is division. Divide both sides of the equation by 29.4 L.

$\frac {1.19 \ atm * 18.7 \ L}{29.4 \ L} =\frac{ P_2 * 29.4 \ L}{29.4 \ L}$

$\frac {1.19 \ atm * 18.7 \ L}{29.4 \ L} =P_2$

The units of liters cancel.

$\frac {1.19 \ atm * 18.7 }{29.4 } =P_2$

$\frac {22.253}{29.4 } \ atm = P_2$

$0.7569047619 \ atm =P_2$

The original measurements all have 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place. The 9 in the ten-thousandth place to the right of this place tells us to round the 6 up to a 7.

$0.757 \ atm \approx P_2$

The pressure of the gas sample is approximately <u>0.757 atmospheres.</u>

3 0

3 years ago

Read 2 more answers

A compound is found to contain 58.80 % xenon, 7.166 % oxygen, and 34.04 % fluorine by mass. what is the empirical formula for th

marissa [1.9K]

To make it easier, assume that we have a total of 100 g of a compound. Hence, we have 58.80g of xenon, 7.166g of oxygen, and 34.04g of fluorine.
Know we will convert each of these masses to moles by using the atomic masses:

58.8/131.3 = 0.45 mole of Xe
7.166/16 = 0.45 mole of O
34.04/19 = 1.79 mole of F

Now, we will divide all the mole numbers by the smallest among them and get the number of atoms in the compound:

Xe = 0.45/0.45 = 1
O = 045/0.45 = 1
F = 1.79/0.45 = 3.98 = 4

So, the empirical formula of the compound XeOF₄

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3 years ago

Giving brainliest to whoever answers, correctly.

velikii [3]

The answer is c. Your welcome

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3 years ago

A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1". KOH + Cu(NO3)2 → KNO

svet-max [94.6K]

2KOH + Cu(NO3)2 → 2KNO3 + Cu(OH)2

2K⁺ 1Cu²⁺ 2K⁺ 1Cu²⁺

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3 years ago

Simbolo quimico del agua asonizada

stiks02 [169]

Answer:

<h2><u>OH-</u> es el símbolo del agua ozonizada.</h2>

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3 years ago