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the average human being contains 60 trillion living cells. if there are currently 7.217 million people on earth. how many moles of living human cells are currently on our planet? if 150billion humans have inhabited the planet in all of history, how many moles of human cells have existed so far on our planet?
the average human being contains 60 trillion living cells. if there are currently 7.217 million people on earth. how many moles of living human cells are currently on our planet? if 150billion humans have inhabited the planet in all of history, how many moles of human cells have existed so far on our planet?
R and T are two elements with the proton number of 11 and 8 respectively. R and T react to form a compound. What is the type of bond and formula of compound?
3Ag(s) + Au(NO3)3(aq) Au(s) + 3AgNO3(s)
The enthalpy of vaporization of compound 24.2 KJ/mol At 15.0°C it has a vapor pressure of 160 mmHg , what is its vapor pressure at 25°C
Draw the monomer/s of nylon 6,6 and PTFE
Calculate the number of atoms present per cubic centimeters of zirconia (ZrO2), which has a density of
6.2 g/cm3
6.2 g/cm3
Hydrogen sulphide reacts with oxygen to produce sulphur dioxide and water. Determine the mass of sulphur dioxide formed if 5.00 g of hydrogen sulphide reacts with excess oxygen. Clearly show your method of calculation.
A 50.0mL solution containing 0.1M H2SO4 and 0.2M maleic acid is titrated with 0.5M NaOH , calculated the pH after each of the addition, a)zero b)10 mL c)20 mL d)30 mL e)40 mL f)50 g)55 h) 60 i)70 mL of NaOH. *
Dmitri Mendeleev was a chemist who made predictions about elements that had not yet been discovered. One of the elements he made predictions about was gallium. He originally called gallium eka-aluminium , suggest why he may have given the undiscovered element this name
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#339914 on Dec 2023
#339914 on Dec 2023