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3 years ago

10

One lawn chair is made of aluminum and another is made of iron. Both chairs are painted the same color. On a sunny day, which ch

air will be hottest to sit in? Explain why.

2 answers:

zavuch27 [327]3 years ago

7 0

Iron would be hotter, aluminum loses heat easier<span />

Afina-wow [57]3 years ago

5 0

The aluminum will be hotter than the other chair (why) it kinda of complicated to explain. XD :)

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Potassium has an atomic number of 19.

aleksandrvk [35]

The correct response would be C. Those in the outermost shell, and of highest electron energy are the valence electrons for potassium.

8 0

4 years ago

The Henry's law constant (kH) for O2 in water at 20°C is 1.28e-3 mol/l atm. How many grams of O2 will dissolve in 3.5 L of H2O t

Sophie [7]

Answer : The mass of $O_2$ dissolved will be, 0.2365 grams

Explanation :

First we have to calculate the concentration of $O_2$ .

As we know that,

$C_{O_2}=k_H\times p_{O_2}$

where,

$C_{O_2}$ = concentration of $O_2$ = ?

$p_{O_2}$ = partial pressure of $O_2$ = 1.65 atm

$k_H$ = Henry's law constant = $1.28\times 10^{-3}mole/L.atm$

Now put all the given values in the above formula, we get:

$C_{O_2}=(1.28\times 10^{-3}mole/L.atm)\times (1.65atm)$

$C_{O_2}=2.112\times 10^{-3}mole/L$

The concentration of $O_2$ = $2.112\times 10^{-3}mole/L$

Now we have to calculate the moles of $O_2$

$\text{Moles of }O_2=\text{Concentration of }O_2\times \text{volume of solution}$

$\text{Moles of }O_2=(2.112\times 10^{-3}mole/L)\times (3.5L)=7.392\times 10^{-3}mole$

Now we have to calculate the mass of $O_2$

$\text{Mass of }O_2=\text{Moles of }O_2\times \text{Molar mass of }O_2$

$\text{Mass of }O_2=(7.392\times 10^{-3}mole)\times (32g/mole)=0.2365g$

Therefore, the mass of $O_2$ dissolved will be, 0.2365 grams

4 0

3 years ago

Sodium fluoride reacts with hydroxyapatite to give fluorapatite according to the chemical reaction:

tatyana61 [14]

We are given the balanced equation 2NaF + Ca10(PO4)6(OH)2 → Ca10(PO4)6F2 + 2NaOH. The fluorapatite is the product together with sodium hydroxide. The ions involved are (PO4) 3-, Ca 2+ and <span>F-. We add the charges and check if the sum is zero, 2*10+-3*6+-1*2 =0. the zero sum tells that the compound has zero charge or neutral</span>

6 0

3 years ago

How many water molecules are in a block of ice containing 1.25 mol of water (H2O)

fomenos

Answer:

Molecules = 7.5 × 10²³ molecules

Explanation:

<u><em>Given:</em></u>

Moles = 1.25 mol

Avogadro's No. = $N_{A}$ = 6.022 * 10²³

<u><em>Required:</em></u>

Molecules = ?

<u><em>Formula:</em></u>

Molecules = Moles × $N_{A}$

<u><em>Solution:</em></u>

Molecules = 1.25 × 6.022 × 10²³

Molecules = 7.5 × 10²³ molecules

3 0

4 years ago

How many moles of NaOH are present in 65.00 g of NaOH(s)? *

schepotkina [342]

Answer:

<h2>The answer is option B</h2>

Explanation:

To find the number of moles we must first find the molar mass of the compound after that we use the formula

$n = \frac{m}{M}$

where

n is the number of moles

M is the molar mass

m is the mass

M(Na) = 23 , M(O) = 16 , M(H) = 1

Molar mass ( NaOH ) = 23+ 16 + 1

= 40 g/mol

mass = 65 g

Substitute the values into the above formula and solve

That's

$n = \frac{65}{40} = \frac{13}{8}$

We have the final answer as

<h3>1.625 moles </h3>

Hope this helps you

6 0

3 years ago