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3 years ago

BRAINLIESTTT ASAP!! PLEASE HELP ME :)

2 answers:

6 0

well there is a certain margin error. If you rounded any number you will not get the right measurement. if you round up when multiplying you will get a larger number then the answer really is and Vise versa.

Misha Larkins [42]3 years ago

4 0

Answer:

See below

Step-by-step explanation:

Measurements

Every measurement must be reported with the correct number of significant figures.

A measurement can contain only one uncertain digit.

Calculations

The results calculated from a measurement are at least as uncertain as the measurement itself.

You must follow the correct significant figure rules for

addition and subtraction
multiplication and division.

You must follow the correct rules for rounding the results of your calculations.

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Combustion of 6.90g of this compound produced 13.8g of CO2 and 5.64g of H2O. What is the empirical formula of the unknown compou

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3 years ago

1. Sam needs to know the volume of a cardboard box. Which tool

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2 years ago

A cylindrical piece of metal is 4.5 dm in height with radius of 5.50 x 10^-5 km.

adell [148]

Answer:

a) $V=4.3x10^3mL$

b) $V=4.3x10^6mm^3$

c) $\rho=1.5x10^5g/L$

Explanation:

Hello,

a) In this case, the given height in cm is:

$h=4.5dm*\frac{1m}{10dm}* \frac{100cm}{1m}=45cm$

And the radius in cm is:

$r=5.50x10^{-5}km*\frac{1000m}{1km}*\frac{100cm}{1m}=5.5cm$

Thus, the volume in cubic centimeters which is also equal in mL (1cm³=mL) is:

$V=\pi (5.5cm)^2*45cm\\\\V=4.3x10^3cm^3=4.3x10^3mL$

b) In this case, the given height in mm is:

$h=4.5dm*\frac{1m}{10dm}* \frac{1000mm}{1m}=450mm$

And the radius in mm is:

$r=5.50x10^{-5}km*\frac{1000m}{1km}*\frac{1000mm}{1m}=55mm$

Thus, the volume in cubic millimeters is:

$V=\pi (55mm)^2*450mm\\\\V=4.3x10^6mm^3$

c) Finally, since 1000 mL equal 1 L, the required density in g/L turns out:

$\rho=\frac{m}{V}=\frac{6.54x10^5g}{4.3x10^3mL}*\frac{1000mL}{1L}\\ \\\rho=1.5x10^5g/L$

Best regards.

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3 years ago

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