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4 years ago

Why is it important for a person heart to be healty

1 answer:

6 0

Its important for a persons heart to be healthy so that it wont get any diseases such as :Cardiomyopathies
Coronary Artery Disease.
Diabetes
Diseases of the Heart Valves.
Heart Defects present at Birth
High Blood Pressure.
Lung Disease such as Emphysema.
Past Heart Attacks

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In a motor, the_____of output work to input work,expressed as a percentage, is the efficiency of the motor.

BartSMP [9]

In a motor, the RATIO of output work to input work, expressed as a percentage, is the efficiency of the motor.

Answer : Ratio

8 0

3 years ago

22. A flask containing 450 mL of 0.50 M H2SO4 was accidentally knocked to the floor. How many grams of NaHCO, do you need to put

Dvinal [7]

Answer: The correct answer is Option D.

Explanation:

To calculate the moles of a solute, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}\text{Volume of solution (in L)}}$

We are given:

Volume of sulfuric acid = 450mL = 0.45 L (Conversion factor: 1 L = 1000 mL)

Molarity of the solution = 0.5 moles/ L

Putting values in above equation, we get:

$0.5mol/L=\frac{\text{Moles of sulfuric acid}}{0.45L}\\\\\text{Moles of sulfuric acid}=0.225mol$

For the given chemical reaction:

$H_2SO_4(aq.)+2NaHCO_3(aq.)\rightarrow Na_2SO_4(aq.)+2H_2O(l)+2CO_2(g)$

By Stoichiometry of the reaction:

1 mole of sulfuric acid reacts with 2 moles of sodium bicarbonate.

So, 0.225 moles of sulfuric acid will react with = $\frac{2}{1}\times 0.225=0.45mol$ of sodium bicarbonate

To calculate the mass of sodium bicarbonate, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of sodium bicarbonate = 0.45 moles

Molar mass of sodium bicarbonate = 84.007 g/mol

Putting values in above equation, we get:

$0.45mol=\frac{\text{Mass of sodium bicarbonate}}{84.007g/mol}\\\\\text{Mass of sodium bicarbonate}=38g$

Hence, the correct answer is Option D.

7 0

3 years ago

Consider the following comparison.

motikmotik

Answer: B yeah I'm pretty sure

8 0

3 years ago

What is the sum of the fractions 2/9+5/9

RUDIKE [14]

Answer:

7\9

Explanation:

please marl brainlieat

6 0

3 years ago

What does Nb stand for on the periodic table? Pls help! Need aware soon

Marina86 [1]

It stands for niobium which was discovered in 1801 by Charles Hatchett of Brittan. It is ussed in welding rods, air fraim systems, superconductive magnets. It gets its name from iobe, the daughter of King Tantalus of the Greek myth. Niobium was considered identical to Tantalum, named after Tantalus, until 1884. Resists corrosin due to an oxide film. It is used in aviation industry

4 0

3 years ago

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