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Sphinxa [80]
3 years ago
15

Which of the following measurements is expressed to three significant figures?

Chemistry
2 answers:
Norma-Jean [14]3 years ago
6 0

Answer:

D

Explanation:

it goes past the decimal three places

LenKa [72]3 years ago
4 0

Answer:

C

Explanation:

A is  1 sig fig

B is 4 sig fig

C is 3 sig fig

D is 2 sig fig

Decimal places do not necessarily determine sig figs.

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Which of the following is an example of a buoyant force acting on a piece of
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Explanation

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What is the density of a liquid if it has a mass of 12.9g ?
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3 years ago
Be sure to answer all parts.The combustion of a 40.0−g gaseous mixture of H2 and CH4 releases 3766 kJ of heat. Calculate the amo
Svetach [21]

Answer:H2=11.4g

CH4=28.6g

Explanation:The complete combustion of the two gases can be represented by a balanced reaction below

1. CH4 +2O2___CO2+2H2O

2.2H2+O2___2H2O

Combining the two we have CH4 +2H2+3O2___

CO2+4H2O

Since the mixture contains 40gof CH4 and 2, therefore 20g of CH4 and 8g of H2 combines.

Calculated from their molecular Mass i.e CH4 12+4×2)=20 and 2H2= 2×2×2=8g

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