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3 years ago

Round this number to two significant figures. 634

Chemistry

2 answers:

Aneli [31]3 years ago

7 0

The answer to this is 630

loris [4]3 years ago

4 0

Answer : The correct answer is 630.

Explanation :

The following rules are used to round off a number to the required number of significant figures:

(1) If the rightmost digit to be removed is more than 5, the preceding number is increased by one.

(2) If the rightmost digit to be removed is less than 5, the preceding number is not changed.

(3) If the rightmost digit to be removed is 5, then the preceding number is not changed if it is an even number but it is increased by one if it is an odd number.

As we are given, 634

In the given number, there are 3 significant figures. Now we have to convert it into 2 significant figures.

According to the rules, round off the given measurement in 2 significant figures as 630 because last number i.e 4 is less than number 5 so, last digit become 0.

Therefore, the correct answer is 630.

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3 years ago

using the symbol M for the element, write the chemical formula for the compound that forms when element M reacts with iodine.

Anon25 [30]

Answer : The chemical formula for the compound is, $MI$

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3 years ago

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Calculate the mass percentage of Na2SO4 in a solution containing 10.9 g Na2SO4 in 482 g water.

boyakko [2]

Answer:

The answer to your question is 2.21 %

Explanation:

Data

mass of Na₂SO₄ = 10.9 g

mass of H₂O = 482 g

Formula

Percent by mass = $\frac{mass of solute}{total mass}$ x 100

Substitution

$Percent by mass = \frac{10.9}{10.9 + 482}$ x 100

Simplification and result

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4 years ago

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lys-0071 [83]

Isotopes are variants atoms of the same element, having same number of atomic(proton) number but different number of neutrons and mass number.

Considering iron-60

The atomic number which also equals the number of protons for the element iron as can be seen on the periodic table is 26

The name iron-60 also tells us that this particlar isotope's mass number is 60.
The chemical symbol for Iron is Fe

Now expressing as an isotope iron-60 becomes ⁶⁰₂₆Fe ( very unstable )

Other stable isotopes of Iron include ⁵⁴₂₆Fe , ⁵⁶₂₆Fe, ⁵⁷₂₆Fe and ⁵⁸₂₆Fe

See more here: brainly.com/question/11236150

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3 years ago