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3 years ago

Why are measurements important for science?

Chemistry

1 answer:

Inga [223]3 years ago

8 0

Answer:

measurements are important to do calculations to get correct results and without them scientists cannot form theories

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You determine the volume of your plastic bag (simulated human stomach) is 1.08 L. How many grams of NaHCO3 (s) are required to f

dsp73

Answer:

3.636 grams of sodium bicarbonate is required.

Explanation:

Using ideal gas equation:

PV = nRT

where,

P = Pressure of gas = 753.5 mmHg = 0.9914 atm

( $1 atm = 760 mmHg$ )

V = Volume of gas = 1.08 L

n = number of moles of gas = ?

R = Gas constant = 0.0821 L.atm/mol.K

T = Temperature of gas = 24.5 °C= 297.65 K

Putting values in above equation, we get:

$(0.9914 atm)\times 1.08 L=n\times (0.0821L.atm/mol.K)\times 297.65K\\\\n=0.0438 mole$

Percentage recovery of carbon dioxide gas = 49.4%

Actual moles of carbon dioxide formed: 49.4% of 0.0438 mole

$\frac{49.4}{100}\times 0.0438 mol=0.02164 mol$

$2NaHCO_3\righarrow Na_2CO_3+H_2O+CO_2$

According to reaction ,1 mol is obtained from 2 moles of sodium bicarbonate.

Then 0.02164 moles f carbon dioxide will be obtained from:

$\frac{2}{1}\times 0.02164 mol=0.04328 mol$

Mass of 0.04328 moles pf sodium bicarbonate:

0.04328 mol × 84 g/mol = 3.636 g

3.636 grams of sodium bicarbonate is required.

5 0

3 years ago

You are given a solution of sugar and sand and water your task is to separate sugar from sand which of the following experimenta

Ostrovityanka [42]

Answer:

Explanation:

Filtration followed by evaporation:

To separate the mixture of sand and sugar, it is best to use the separation technique of filtration then evaporation.

Pour the water into the mixture. The sugar will dissolve with time in the water. Sand is made up of quartz and does not dissolve in water.

After the dissolution, filter the solution to separate the sand using a filter paper.

Dry the sand thereafter then proceed to evaporate the sugar with water solution. Evaporation will turn water into vapor and the sugar crystals will be left behind.

8 0

3 years ago

WILL MARK AS BRAINLIEST Name the following ionic compounds.

STALIN [3.7K]

1) Magnesium Chloride
2) Sodium Bromide
3) Magnesium Oxide
4) Nickel (III) Fluoride
5) Aluminum Chloride
6) Rubidium Sulfide
7) Gallium Nitride
8) Calcium Sulfide
9) Lead (IV) Oxide
10) Cobalt (II) Oxide
11) Beryllium Sulfide
12) Cesium Nitride

7 0

3 years ago

Which is the chemical formula of hydrobromic acid?

harkovskaia [24]

HBr is the formula for hydrobromic acid

4 0

3 years ago

Read 2 more answers

A sample of juice has a pH of 4.2. Whsat is the concentration in mol/dm3 of OH in the juice?

Annette [7]

Answer:

6 * 10^-4M

Explanation:

use this equation

[ H + ] = 10 − pH

6 0

3 years ago