What is the molar mass of a substance?

2 answers:

6 0

Molar mass also called Atomic mass is the atomic weight. You can find this on the periodic table.
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The answer would be
A. the mass in grams of one mole of a substance

suter [353]4 years ago

3 0

Answer: Option (a) is the correct answer.

Explanation:

Molar mass is defined as the mass in grams of one mole of a substance.

Mathematically, Molar mass = $\frac{mass in grams}{moles of substance}$

For example, molar mass of 1 mole of $CH_{4}$ molecule will be calculated as follows.

Molar mass of $CH_{4}$ = $mass of carbon atom + 4 \times mass of hydrogen atom$

= $12 + 4 \times 1$

= 16 g

Therefore, 1 mole of $CH_{4}$ molecules has a molar mass of 16 g.

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A compound that allows for communication between one cell and the next is called _________

-Dominant- [34]

<h2>Answer:</h2>

The compound is known as the neurotransmitter or messenger chemicals.

<h3>Explanation:</h3>

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Some hormones are also known as messenger chemicals.
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7 0

3 years ago

Calculate the pH of a solution formed by dissolving 0.040 moles of solid sodium lactate, NaC3H5O3, in 50.0 mL of 1.0 M HC3H5O3.

natima [27]

The pH of the solution is 3,76

Why?

To solve this problem we have to apply the Henderson-Hasselbach equation, which is used whenever we need to calculate the pH of a solution of an acid HA (Lactic Acid) and its conjugate base A⁻ (Sodium Lactate)

We can use either moles or concentrations for this equation. In this case, we are going to use the moles, and we are going to take the pKa of lactic acid as 3,86:

$pH=pKa+log(\frac{nA^- }{nHA} )=3,86+log(\frac{(0,04moles)}{(0,05mL)*(1.0M)} )\\\\pH=3,76$