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3 years ago

A cube has a mass of 42 grams and a volume of 15 cubic centimeters. What is it’s density?

Chemistry

1 answer:

deff fn [24]3 years ago

6 0

Answer:

2.8g/cm³

Explanation:

Given parameters:

Mass of cube = 42g

Volume of cube = 15cm³

Unknown:

Density of the cube = ?

Solution:

Density is defined as the mass per unit volume of a substance. It is mathematically expressed as:

Density = $\frac{mass}{volume}$

So;

Density = $\frac{42}{15}$ = 2.8g/cm³

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Answer:

it would do wonders for the health of those using them and, by extracting energy from the fuel more efficiently, would be more environmentally sustainable too.

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2 years ago

qual a concentração de uma solução contendo 50g de cloreto de sódio dissolvidos em 250ml de solução

anygoal [31]

Answer:

200 g/L

Explanation:

The concentration of a solution (also called molarity) can be calculated with the formula:

$M=\frac{m}{V}$

where

m is the mass of the solute

V is the volume of the solution

For the solution in this problem we have:

m = 50g is the mass of the solute

V = 250 mL = 0.250 L is the volume of the solution

Therefore, the concentration of the solution is:

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3 years ago

Solid potassium and fluorine gas are produced by the decomposition of solid potassium fluoride. Write a balanced chemical equati

lyudmila [28]

The chemical equation that you need is:

$2KF(s)\ \to\ 2K(s) + F_2(g)$

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3 years ago

Read 2 more answers

30g of glucose and 20 g common salt is dissolved in 500 mL of water to make solution. Calculate the concentration of a (a) gluco

WINSTONCH [101]

Answer:

The answer of a is 5.45% and b is 3.64%

Explanation:

Density of water = 1 g/mL

∴ Mass of water (solvent) = 500 g

Mass of solute (glucose) = 30 g

Mass of solute (common salt) = 20g

Mass of solution = (30 + 20 + 500) g = 550 g

Mass percentage of solution for glucose

= Mass of solute (gucose)/Mass of solution × 100

= 30/550 x 100

= 5.45 %

Mass percentage of solution for common salt

= Mass of solute (common salt)/Mass of solution × 100

= 20/550 × 100

= 3.64 %

Thus, The answer of a is 5.45% and b is 3.64%

<u>-</u><u>The</u><u>U</u><u>nknown</u><u>S</u><u>cientist</u><u> </u><u>72</u>

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2 years ago

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sergiy2304 [10]

The symbolic notation for such isotope is $19_{O}$ (it is an oxygen isotope)

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3 years ago