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11 months ago

Calculate the mass (in grams) of 250mL of ether at 25 oC. The density of

Chemistry

1 answer:

leonid [27]11 months ago

6 0

Volume=250mL
Density=0.71g/ml

$\boxed{\sf Density=\dfrac{Mass}{Volume}}$

$\\ \sf{:}\implies Mass=Density(Volume)$

$\\ \sf{:}\implies Mass=0.71(250)$

$\\ \sf{:}\implies Mass=177.5g$

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Brooke decides to model a lunar eclipse. She attaches a large poster of the Sun to her wall to represent the Sun. She then decid

koban [17]

Answer:

its D

Explanation:

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1 year ago

If water’s density is 1.0 g/mL, then would the perfume be more or less dense than water? Would the perfume float on top or sink

Alex17521 [72]

Answer:

usually the perfumes are made of aromatic hydrocarbons invloving

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Hope this helps you

Explanation:

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1 year ago

A 0.15 m solution of chloroacetic acid has a ph of 1.86. What is the value of ka for this acid?

dem82 [27]

Answer: $1.67\times 10^{-3}$

Explanation:

$ClCH_2COOH\rightarrow ClCH_2COO^-+H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Given: c = 0.15 M

pH = 1.86

$K_a$ = ?

Putting in the values we get:

Also $pH=-log[H^+]$

$1.86=-log[H^+]$

$[H^+]=0.01$

$[H^+]=c\times \alpha$

$0.01=0.15\times \alpha$

$\alpha=0.06$

As $[H^+]=[ClCH_2COO^-]=0.01$

$K_a=\frac{(0.01)^2}{(0.15-0.15\times 0.06)}$

$K_a=1.67\times 10^{-3]$

Thus the vale of $K_a$ for the acid is $1.67\times 10^{-3}$

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1 year ago

List the salts in order from weakest to strongest lattice energy (most positive to most negative). magnesium chloride, barium ch

almond37 [142]

Answer: Option (6) is the correct answer.

Explanation:

Lattice energy is described as the energy released when formation of 1 mole of an ionic compound occurs due to the combination of its constituent ions.

Also, lattice energy is inversely proportional to the distance between the cation and anion. And, when we move down a group then there occurs an increase in the atomic radii of the atoms.

This means that smaller is the ionic distance between the cation and anion, more will be the lattice energy between the atoms.

Therefore, order from weakest to strongest lattice energy (most positive to most negative) for the given compounds is as follows.

barium chloride < strontium chloride < calcium chloride < magnesium chloride

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1 year ago

How many atoms are in a molecule of RSq?

Wewaii [24]

2 atoms in a molecule of RSq, TSq contains 3 different types of atoms (Sq, R, and T.)

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1 year ago