The mass of MgO needed to produce 4.8 tonnes of Mg is
8 tonnes or 2,000 Kg or 2,000 ,000 g
calculation
Si + 2 MgO = SiO2 +2 Mg
step 1 :find the moles of Mg
moles = mass/molar mass
mass = 4.8 tonnes = 480,000 g
molar mass = 24 g/mol
moles is therefore = 480,000 g/24g/mol = 200,000 moles
then by use of mole ratio between MgO to Mg which is 1:1 therefore the moles of MgO is also = 200,000 moles
mass of MgO = moles of MgO x molar mass of MgO
molar mass of MgO = 24 + 16 =40 g/mol
therefore the mass = 200,000 moles x 40 g/mol = 8,000,000 grams or 8,000,000/1000= 8,000 Kg or 8,000/1000 = 8 tonnes
Answer:
Removing the dirty water and replacing with fresh water. also the fish containing in the aquarium change the system of aquarium.
Where you live is irrelevant - it means where you live in TIME. we are currently in the cenezoic era, quaternary period, holocene epoch.
<h2>~<u>Solution</u> :-</h2>
Here, we have been given the the amount of helium to be 52 amu.
Thus,
- Atomic mass of Helium is 4u = 2 protons + 2
- Neutrons = 1 atom.
- No. of atoms in 52u = $ \sf{\frac{52}{4}}$ = 13 atoms.
$ \red{\leadsto}$ Hence, the number of atoms will be <u>13 atoms</u>.
Answer:
B. Temperature
Explanation:
A thermometer is a device used to measure temperature. Temperature is the average kinetic energy of a material's molecules or its average thermal energy. Heat is transferred to the thermometer, causing changes in its physical properties.