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3 years ago

14

Consider the graph below. Which phase change is most likely taking place in this graph? a gas to a liquid a liquid to a solid a

gas to a solid a solid to a liquid

1 answer:

luda_lava [24]3 years ago

4 0

A solid to a liquid

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Hii can someone help me pls this is the last question

lara31 [8.8K]

Answer:

B. 126

Explanation:

the scale is 1 to 42 so the scale would be:

3 cm:x cm

3 * 42 = 126 cm

8 0

2 years ago

Hemoglobin, a protein in red blood cells, carries O2 from the lungs to the body's cells. Iron (as ferrous ion, Fe2+) makes up 0.

levacccp [35]

<u>Answer:</u> The number of $Fe^{2+}$ ions in one molecule of hemoglobin are 4.

<u>Explanation:</u>

According to mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

We are given:

Mass of 1 mole of hemoglobin = $6.8\times 10^4g$

Using above equation:

$6.022\times 10^{23}$ number of molecules have a mass of $6.8\times 10^4g$

So, 1 molecule of hemoglobin will have a mass of $\frac{6.8\times 10^4g}{6.022\times 10^{23}}\times 1=1.129\times 10^{-19}g$

It is also given that 0.33 mass % of hemoglobin has $Fe^{2+}$ ions

So, mass of $Fe^{2+}$ ions will be = $\frac{0.33}{100}\times 1.129\times 10^{-19}g=3.7257\times 10^{-22}g$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of iron ion = $3.7257\times 10^{-22}g$

Molar mass of iron ion = 55.85 g/mol

Putting values in above equation, we get:

$\text{Moles of }Fe^{2+}\text{ ion}=\frac{3.7257\times 10^{-22}g}{55.85g/mol}=6.67\times 10^{-24}mol$

Using mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

So, $6.67\times 10^{-24}$ moles of hemoglobin will contain = $6.022\times 10^{23}\times 6.67\times 10^{-24}=4$

Hence, the number of $Fe^{2+}$ ions in one molecule of hemoglobin are 4.

8 0

3 years ago

What type of specialized cell in the eye is used for detecting low levels of light?

Vladimir [108]

Answer:

Cone Cell

Explanation:

There are about six to seven million cones in a human eye and are most concentrated towards the macula. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.

4 0

3 years ago

How important is economic in your everyday life

docker41 [41]

Answer:

it is mega important.

Explanation:

3 0

3 years ago

In Part A, we saw that the theoretical yield of aluminum oxide is 0.700 mol . Calculate the percent yield if the actual yield of

s2008m [1.1K]

Considering the definition of percent yield, the percent yield is 76%.

<h3>Percent yield</h3>

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

$percent yield=\frac{actual yield}{theorical yield}x100$

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

<h3>Percent yield in this case</h3>

In this case, you know:

actual yield= 0.532 moles
theorical yield= 0.700 moles

Replacing in the definition of percent yield:

$percent yield=\frac{0.532 moles}{0.700 moles}x100$

Solving:

<u><em>percent yield= 76%</em></u>

Finally, the percent yield is 76%.

Learn more about percent yield:

brainly.com/question/14408642

#SPJ1

3 0

2 years ago