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4 years ago

How many significant figures are in the measurement 230 kg?

2 answers:

azamat4 years ago

8 0

There are three significant figures.

Zeros in front of numbers don't count, but those after the numbers do count.

Therefore 230 is written to 3s.f.

Burka [1]4 years ago

3 0

Ther are alot of significant figures

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If you stretch back a rubber band and release it, it shoots across the room. What type of energy conversion has occurred?

MAVERICK [17]

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3 years ago

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Using dots and crosses draw the structure of ethane molecule

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Answer:

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3 years ago

How many grams of potassium bromide, KBr, are in 100mL of a 0.50 M solution?

VMariaS [17]

Answer:

5.95g

Explanation:

1 $dm^{3}$ = 1000 mL

∴ 100 mL = 100 ÷ 1000 = 0.1 $dm^{3}$

Volume = 0.1 $dm^{3}$

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Concentration = $\frac{No. of moles}{volume}$

0.5 = $\frac{x}{0.1}$

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No. of moles = $\frac{mass}{mass. in. 1. mole}$

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3 years ago

Which are homogeneous mixtures? check all that apply

marishachu [46]

Answer:

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3 years ago

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How many mols are in 151 g of dinitrogen monoxide?

oksano4ka [1.4K]

Answer:

3.43 moles

Explanation:

To convert moles into grams you must take the number of grams and divide it by the atomic mass of the compound.

in this case, grams is 151 and N2O has an atomic mass of 44.013

so your equation would look like

151/44.013=3.430804535

your answer would be 3.43 moles

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3 years ago