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3 years ago

What does the little 2 in 2CO2 mean?

Chemistry

1 answer:

Olenka [21]3 years ago

4 0

Answer:

it means 2 oxygen atoms in the molecule

Explanation:

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Why does CCl4 dissolve in iodine

nirvana33 [79]

Answer: They are both non polar molecules compounds although water is a polar molecule compound. There are no significant attractions.

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3 years ago

When a deer eats too much in a given area, we call this _________.

Sophie [7]

Answer:

Over-browsing

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4 years ago

What is the percent by mass of water in MgSO4 • 7H2O? A. 51.1% B. 195% C. 56.0% D. 21.0%

lbvjy [14]

Answer : The correct option is, (A) 51.1%

Explanation :

Mass percent : It is defined as the mass of the given component present in the total mass of the compound.

Formula used :

$\text{Mass} \%H_2O=\frac{\text{Mass of }H_2O}{\text{Mass of }MgSO_4.7H_2O}\times 100$

First we have to calculate the mass of $H_2O$ and $MgSO_4.7H_2O$ .

Mass of $H_2O$ = 18 g/mole

Mass of $7H_2O$ = 7 × 18 g/mole = 126 g/mole

Mass of $MgSO_4.7H_2O$ = 246.47 g/mole

Now put all the given values in the above formula, we get the mass percent of $H_2O$ in $MgSO_4.7H_2O$ .

$\text{Mass} \%H_2O=\frac{126g/mole}{246.47g/mole}\times 100=51.1$

Therefore, the mass percent of $H_2O$ in $MgSO_4.7H_2O$ is, 51.1%

6 0

3 years ago

100 POINTS PLEASE ANSWER!

Tatiana [17]

Answer:

Answer would be 4/2

Explanation:

A is the best answer choice because it was between A and D but 2 is not the denominator so it couldnt be D

5 0

3 years ago

Read 2 more answers

For a reaction: aA → Products, [A]o -4.3 M, and the first two half-lives are 56 and 28 minutes, respectively. Calculate k (witho

Mkey [24]

Answer:

C. $3.8\times 10^{-2}$

Explanation:

We are given that

Initial concentration, $[A]_o=4.3 M$

First half life, $t_{\frac{1}{2}}=56$ minutes

Second half life, $t'_{\frac{1}{2}}=28$ minutes

We have to find K.

The given reaction is zero order reaction.

We know that for zero order reaction

$t_{\frac{1}{2}}=\frac{[A]_o}{2k}$

Using the formula

$56=\frac{4.3}{2k}$

$k=\frac{4.3}{2\times 56}$

$k=3.8\times 10^{-2}$

Hence, option C is correct.

4 0

3 years ago