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3 years ago

Isotopes of the same element have different

1 answer:

5 0

Isotopes of the same element have different mass numbers.

C. mass numbers.

one mole of copper has 6.02 x 10²³ atoms

C. 6.02 * 10²³ atoms.

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A graduate cylinder was filled to 25.0 mL with a liquid. A solid object weighting 39.7 g was immersed in the liquid, raising the

ELEN [110]

Answer:

184478 qreo si si es es hola

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3 years ago

What are the characteristics of a plasma

Lyrx [107]

A plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that plasmas are considered a distinct "fourth state of matter

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4 years ago

Read 2 more answers

What is the volume occupied by 3.00 mol of hydrogen gas at STP? *

xxTIMURxx [149]

Answer: V=67.2 L

Explanation:

For this problem we will need to use the Ideal Gas Law.

Ideal Gas Law: PV=nRT

P=1.00 atm (STP)

V=?

n=3.00 mol

R=0.08206Latm/Kmol

T=273.15 K (STP)

To find V, we would manipulate the equation to V=nRT/P

$V=\frac{(3.00 mol)(0.08206Latm/Kmol)(273.15K)}{1.00 atm}$

$V=67.244 L$

With significan figures, our answer is V=67.2 L.

6 0

3 years ago

What is the empirical formula for a compound that contains 10.89% magnesium 31.77% chloride and 57.34% oxygen

Blizzard [7]

Answer: $Mg_{1}Cl_{2}O_{8}$

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 Mg = 10.89 g

Mass of Cl = 31.77 g

Mass of O = 57.34 g

Step 1 : convert given masses into moles.

Moles of Mg= $\frac {\text{ given mass of Mg}}{\text{ molar mass of Mg}}= \frac {10.89g}{24g/mole}=0.45moles$

Moles of Cl = $\frac {\text{ given mass of Cl}}{\text{ molar mass of Cl}}= \frac {31.77g}{35.5g/mole}=0.89moles$

Moles of O = $\frac {\text{ given mass of O}}{\text{ molar mass of O}}=\frac {57.34g}{16g/mole}=3.58moles$

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

For Mg = $\frac {0.45}{0.45}=1$

For Cl = $\frac {0.89}{0.45}=2$

For O= $\frac {3.58}{0.45}=8$

The ratio of Mg :Cl : O= 1 : 2 : 8

Hence the empirical formula is $Mg_{1}Cl_{2}O_{8}$

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3 years ago

In order to ice to melt it must absorb heat This makes it an blank process.

sveta [45]

Answer: A. Endothermic

Explanation:

In an endothermic reaction, heat is sucked in from the surrounding area by the reactants so that they may use it to react and form new products. This will therefore reduce the temperature in the said surrounding by the amount that the reaction needed.

This is what ice does when it melts. It sucks in the heat surrounding the area and then melts but leaves the area colder. For instance, putting ice in water ensures that the ice melts but because it sucked in the heat from the water to do so, the water gets colder as a result.

7 0

3 years ago