When the T-shirt comes out of the clothes dryer, it is so warm that molecules from the detergent and fabric soft ener are likely to have changed phase and become gases. When they reach your nose, you are able to smell them.

Explanation:

3 0

2 years ago

What is the transition interval for phenol red? 24 a. pH 3.1-4.4 b. pH 6.4-8.0 c. pH 6.2-7.6 d. pH 8.0-10.0

alukav5142 [94]

Answer:

The correct option is: b. pH 6.4-8.0

Explanation:

Phenol red is a weak acid that is used as a pH indicator and exists in the form of stable red crystals.

The color of the phenol red solution changes from yellow to red when the change in pH is observed. The color of phenol red transitions from yellow to red when the pH is 6.8 - 8.2 or 6.4 - 8.0

Above the pH of 8.2, the phenol red solution turns a bright pink in color.

6 0

3 years ago

Help asap. How many moles are 5.55x10^25 atoms of Mg

LekaFEV [45]

Answer:

$\boxed {\boxed {\sf About \ 92.2 \ moles \ of \ Magnesium}}$

Explanation:

To convert from atoms to moles, we must Avogadro's number:

6.022*10²³

This number tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, it is atoms of magnesium in 1 mole.

6.022 *10²³ atoms Mg / 1 mol mg

Now, let's set up an expression using:

$\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Multiply this by the given number of atoms.

$5.55*10^{25} \ atoms \ Mg *\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Flip the fraction so the atoms of magnesium can cancel.

$5.55*10^{25} \ atoms \ Mg *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23} \ atoms \ Mg}$

$5.55*10^{25} *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23}}$

Multiply and condense this into 1 fraction.

$\frac { 5.55*10^{25} \ mol \ Mg }{6.022 * 10^ {23}}$

$92.1620724 \ mol \ Mg$

The original measurement had 3 significant figures, so our answer must have that many as well. For the number we calculated, that is the tenth place. The 6 in the hundredth place tells us to round the 1 to a 2.

$92.2 \ mol \ Mg$

It is about 92.2 moles of magnesium.

3 0

3 years ago