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inysia [295]
3 years ago
12

Calculate the mass of 0. 4 moles of water.​

Chemistry
1 answer:
Anna [14]3 years ago
5 0

Answer:

7.208 g

Explanation:

0.4mol x \frac{2(1.01) + 16.00 g}{1 mol}

= 7.208 g

You are using molar mass of H20 to find the mass. Moles of 0.4 and 1 mol cancel out leaving you with just grams. You get the values in the numerator from the periodic table and the 2(1.01) is because you have 2 of the H in H20

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A change in the force of gravity on an object will affect its weight.

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3 years ago
) PABA refers to para-aminobenzoic acid which is used in some sunscreen formulations. If a 0.055 M solution of PABA has a pH of
AleksandrR [38]

Answer: K_a of PABA is 0.000022

Explanation:

NH_2C_6H_5COOH\rightarrow H^++NH_2C_6H_5COO^-

  cM              0             0

c-c\alpha        c\alpha          c\alpha

So dissociation constant will be:

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

Give c= 0.055 M and \alpha = ?

K_a=?

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2.96=-log[H^+]

[H^+]=1.09\times 10^{-3}

[H^+]=c\times \alpha

1.09\times 10^{-3}=0.055\times \alpha

\alpha=0.02

Putting in the values we get:

K_a=\frac{(0.055\times 0.02)^2}{(0.055-0.055\times 0.02)}

K_a=0.000022

Thus K_a of PABA is 0.000022

5 0
3 years ago
A) Explain what is meant by anisotropic refinement <br>​
Rina8888 [55]

Answer:

ok

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(answer is from go0gle not gonna say its lie)

6 0
2 years ago
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likoan [24]

Answer:

pH = - log(0.000765)

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6 0
3 years ago
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lakkis [162]

Answer:

The ionic bond present between CaO molecule

Explanation:

7 0
2 years ago
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