N an experiment, Theresa measured 15.00 mL of water. She must have used a

Can somebody plz help answer these questions correctly (only if u know the answer) thanks! :3

ss7ja [257]

1. Reduce, reuse, and recycle

Conserve water

plant a tree

2. An environmentally aware business considers more than just profits — it considers its impact on society and the environment. Such a business is sustainable because it contributes to the health of the structure within which it operates, thereby helping construct an environment in which the business can thrive.

3. Aboriginal people are rich in environmental knowledge and can provide important perspectives when considering the impact of economic decisions on the environment. Aboriginal people are also a source of sustainability strategies that can contribute to our collective well-being.

:D

3 0

3 years ago

A pure substance is found to have an empirical formula of CH and a molar mass of 78.114 grams. What is the molecular formula of

harkovskaia [24]

Answer:

Explanation:

Skamn jeksk

7 0

3 years ago

What is the subscript present in NaCl?

jonny [76]

Answer:

NaCl or sodium chloride, is commonly known as table salt. ... Subscripts show the ratio of atoms of different elements in the compound. Since there are four hydrogen atoms in the molecule, the subscript 4 follows the symbol for hydrogen.

Explanation:

3 0

4 years ago

Read 2 more answers

An acidic solution at 25°c will have a hydronium ion concentration ________ and a ph value ________.

lesantik [10]

The given question is incomplete. The complete question is:

An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.

$[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

$[H_3O^+]$ < $1\times 10^{-7}$ , pH < 7.00

$[H_3O^+]$ < $1\times 10^{-7}$ ,, pH > 7.00

$[H_3O^+]$ > $1\times 10^{-7}$ ,, pH > 7.00

Answer: $[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

$pH=-\log [H_3O^+]$

$7=-log[H_3O^+]$

$[H_3O^+]=10^{-7}$

As pH of acids is less than 7, the hydronium ion concentration is greater than

Thus the correct option is $[H_3O^+]$ > $1\times 10^{-7}$ M, pH < 7.00

3 0

4 years ago

. The Henry's law constant for helium gas in water at 30 ∘C is 3.7×10−4M/atm; the constant for N2 at 30 ∘C is 6.0×10−4M/atm. a.

ludmilkaskok [199]

Explanation:

1) Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.

To calculate the molar solubility, we use the equation given by Henry's law, which is:

$M_{g}=K_H\times p_{g}$

where,

$K_H$ = Henry's constant

$p_{He}$ = partial pressure of gas

a) $K_H=3.7\times 10^{-4} M/atm$

$p_{He}=2.1 atm$

Putting values in above equation, we get:

$M_{He}=3.7\times 10^{-4} M/atm\times 2.1 atm = 7.77\times 10^{-4} M$

The solubility of helium gas is $7.77\times 10^{-4} M$

b) $K_H=6.0\times 10^{-4} M/atm$

$p_{N_2}=2.1 atm$

Putting values in above equation, we get:

$M_{He}=6.0\times 10^{-4} M/atm\times 2.1 atm = 1.26\times 10^{-3} M$

The solubility of nitrogen gas is $1.26\times 10^{-3} M$

2)

a) Mass of solute or methanol , m= 14.7 g

Mass of solvent or water , m'= 186 g

Mass of the solution = M = m + m' = 14.7 g + 186 g = 200.7 g

$w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$

$=\frac{14.7 g}{200.7 g}\times 100=7.32\%$

The mass percent of methanol is 7.32%.

b) Molality is defined as moles of solute per kilograms of solvent.

$m=\frac{\text{Moles of solute}}{\text{Mass of solvent in kg}}$

Moles of methanol = $\frac{14.7 g}{32 g/mol}=0.4594 mol$

Mass of solvent = 186 g = 0.186 kg

$m=\frac{0.4594 mol}{0.186 kg}=2.4610 mol/kg$

The molality of methanol is 2.4610 mol/kg.

4 0

3 years ago