Answer:
1.99moles
Explanation:
molar mass of HCl = 1 + 35.5 = 36.6 g/mol
reacting mass of HCl = 72.9 grams
number of moles= reacting mass÷molar mass
= 72.9÷36.6
=1.99mol
Particles in solids are tightly packed together.
Instead of moving past each other like liquids and gases, solids tend to vibrate instead
3 electrons are transferred by the carbon
1.12kg
Explanation:
Given parameters:
Volume of helium blimp = 6.28 x 10⁹mm
Density of helium in the blimp = 0.1786g/cm³
Unknown:
Mass of helium in the blimp = ?
Solution:
Density is defined as the mass per given volume of a substance.
Density = ![\frac{mass}{volume}](https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D)
We need to convert the volume to a unit we can work with which is cm³
1000L = 1cm³
1mL = 10⁻³L or
1000mL = 1L
6.28 x 10⁹mL = ![\frac{6.28 x 10^{9} }{1000}](https://tex.z-dn.net/?f=%5Cfrac%7B6.28%20x%2010%5E%7B9%7D%20%7D%7B1000%7D)
= 6.28 x 10⁶L
since 1000L = 1cm³
6.28 x 10⁶L gives ![\frac{6.28 x 10^{6} }{1000}](https://tex.z-dn.net/?f=%5Cfrac%7B6.28%20x%2010%5E%7B6%7D%20%7D%7B1000%7D)
= 6.28 x 10³cm³
Mass = density x volume = 0.1786 x 6.28 x 10³m³ = 1121.608g or 1.12kg
Learn more:
Density brainly.com/question/8441651
#learnwithBrainly
Answer:
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Explanation:
A sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up.