For machines such as a rake the output force is less than the input force. If the input force of the rake is 10 newtons and the output force is 5 Newtons mechanical advantage is .5
Answer:
a substance that dissolves in another substance
Explanation:
a substance into which another substance dissolves
Answer:
"The core of the Sun extends from the center to about 20–25% of the solar radius. It has a density of up to 150 g/cm3 (about 150 times the density of water) and a temperature of close to 15.7 million kelvins (K)"
- goggle
<h2>A sample of gold (Au) has a mass of 72.04g. Calculate the number of atoms of gold (Au): It is equal to ==2.207 x 10²³ number of atoms </h2>
Explanation:
we can find number of atoms in a given sample by the formula :
Number of atoms = Given mass /atomic mass x Avogadro's number
or , it can be written as :
Number of atoms = given mass /atomic mass x 6.022 x 10²³
Now in above asked question , the values given are :
Mass of sample of gold = 72.04g
Atomic mass of gold : 196.6
Avogadro's number = 6.023 x 10²³
so, using the above formula we have :
Number of atoms = 72.04 /196.6 x 6.022 x 10²³
= 0.3664 x 6.022 x 10²³
=2.207 x 10²³ number of atoms
Answer:-
5
Explanation:-
Chemical formula for calcium oxide = CaO
Chemical formula of water = H2O
Chemical Formula of Calcium Hydroxide = Ca(OH)2
Mass of Ca(OH)2 = 370g
Molar mass of Ca(OH)2 = 40 x 1 + ( 16 x 1 + 1 x 1 ) x 2
= 74 g mol-1
Number of moles of Ca(OH)2 = 370 g / 74 g mol-1
= 5 moles
The balanced chemical equation for this process is
CaO + H2O --> Ca(OH)2
From the equation we see
For 1 mol of Ca(OH)2 to form, 1 mol of CaO is needed to react.
For 5 mol of Ca(OH)2 to form, 5 x 1 / 1 = 5 mol of CaO is needed to react.
