3 years ago

Which particle has two positive charge and an electron arrangement of 2, 8?

1 answer:

8 0

The answer is $Mg^{2+}$ . A magnesium atom has 12 protons and an arrangement of [2, 8, 2]. When you lose two electrons, arrangement becomes [2,8] and the atom becomes a positively charged ion

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If you collect 1.75 L of hydrogen gas during a lab experiment when the room temperature is 23oC and the barometric pressure is 1

ziro4ka [17]

Answer:

$n=0.0747mol$

Explanation:

Hello,

In this case, since we can consider hydrogen gas as an ideal gas, we check the volume-pressure-temperature-mole relationship by using the ideal gas equation:

$PV=nRT$

Whereas we are asked to compute the moles given the temperature in Kelvins, thr pressure in atm and volume in L as shown below:

$n=\frac{105kPa*\frac{0.009869atm}{1kPa}*1.75L}{0.082\frac{atm*L}{mol*K}*(23+273.15)K} \\\\n=0.0747mol$

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3 years ago

Any mechanical device which is used to help people do work is a <br> .a0

KIM [24]

Any mechanical device which is used to help people is a (machine)
the answer is machine

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3 years ago

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In the following reaction 6.13 g of water is actually produced, but the theoretical yield of water is 8.17 g. What is the percen

CaHeK987 [17]

Answer:

75.0%

Explanation:

Data obtained from the question. This includes the following:

Actual yield = 6.13g

Theoretical yield = 8.17g

Percentage yield =...?

The percentage yield can be obtain by using the following formula:

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 6.13/8.17 x 100

Percentage yield = 75.0%

Therefore, the percentage yield of water from the reaction above is 75.0%

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3 years ago

Elements that are good conductors of heat and electric current. On the left side of the periodic table. Majority of elements. Wh

lilavasa [31]

Answer:

As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. The alkaline earth elements are metallic elements found in the second group of the periodic table.

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3 years ago

At what temperature will 0.654 moles of helium gas occupy 12.30 liters at 1.95 atmospheres

pshichka [43]

Answer:

477 K

Explanation:

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3 years ago