All categories

3 years ago

Help me please omg

Chemistry

1 answer:

Sever21 [200]3 years ago

4 0

Answer:

NH₃

M = n/V(L)

0.844 mol (Both numbers have 3 significant figures so the result has 3 significant figures as well)

Explanation:

Step 1: Given and required data

Volume of solution (V): 375. mL

Molar concentration of the solution (M): 2.25 M

Chemical formula for ammonia: NH₃

Step 2: Calculate the moles (n) of ammonia (solute)

Molarity is equal to the moles of solute divided by the liters of solution.

M = n/V(L)

n = M × V(L)

n = 2.25 mol/L × 0.375 L = 0.844 mol (Both numbers have 3 significant figures so the result has 3 significant figures as well)

You might be interested in

How many oxygen atoms are present in 3 grams of glucose

Kaylis [27]

Answer:

Because CLEARLY, each mole of glucose, C6H12O6 contains 6⋅mol oxygen atoms.

5 0

3 years ago

What are two things plants have which animal cells do not

lyudmila [28]

Answer:

Animal cells don't have a dividing cell wall like plant cells do

Explanation:

Plants cells use photosynthesis from the sun, which requires them to have chloroplast filled with chlorophyll to complete this function; animal cells do not have chloroplasts

5 0

3 years ago

Read 2 more answers

For this reaction: 4 Al + 3O2 = 2 Al2O3

MariettaO [177]

0.347 mols, working out shown on photo

7 0

3 years ago

An aqueous solution contains 0.29 M of benzoic acid (HA) and 0.16 M of sodium benzoate (A-). If the pH of this solution was meas

Inga [223]

Answer:

pKa = 4.89.

Explanation:

We can solve this problem by using the Henderson-Hasselbach equation, which states:

pH = pKa + log $\frac{[A^-]}{[HA]}$

In this case [A⁻] is the concentration of sodium benzoate and [HA] is the concentration of benzoic acid.

We input the given data:

4.63 = pKa + log $\frac{0.16}{0.29}$

And solve for pKa:

pKa = 4.89

3 0

3 years ago

Find the value of x in the triangle

myrzilka [38]

Answer:

55.52°

Explanation:

Concept tested: Sine rule of triangles

We need to know the sine rule

According to sine rule, if the three sides of a triangle are a, b and c and the corresponding angles, A, B and C

Then, $\frac{a}{SinA}=\frac{b}{SinB}=\frac{c}{SinC}$

In this case;

If we take, a = 5.7 units and A = 70°, and

b= 5 units, B = x°

Using the sine rule we can find the value of x

Therefore;

$\frac{a}{SinA}=\frac{b}{SinB}$

Then;

$\frac{5.7}{Sin70}=\frac{5}{Sinx}$

$6.0658=\frac{5}{sinx}$

$Sinx=0.8243$

Therefore, X = 55.52°

Therefore, the value of x in the triangle is 55.52°

6 0

3 years ago