Question
Which of the following relation is
correct?Solution
The number of atoms of ANY substance in a volume is: # of atoms = N × (density) × volume / (Molecular Weight). N is a constant called Avogadro's number and its equal to 6.022×1023 atoms/mole. It can also be molecules per mole. Avogadro's number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022 × 1023 mol-1 and is expressed as the symbol NA.
If sin x + cos x = √2 sin x, then the value of sin x - cos x is:
If A lies in the first quadrant and 6 tan A = 5, then the value of 8 sin A−4 cos A / cos A+2 sin A is :
If x+ 1/x = 2cosθ, then the value of x³+ 1/x³ is
If sin5A = cos(2A+20°), then what is the value of A? Given that 5A is an acute angle.
If sec a + tan a = 3, find the value of sin a.
If sec(2A + B) = 2 and cos(A + B) = (1/√2) , find the value of {sec 2B + tan (A + B) } given that 0o < A, B < 90o
- If sin(A + B) = 1/2 and cos(A + 2B) = √3/2, where 0° < A, B < 90°, then find the value of tan(2A).
If α means +, β means -, ɣ means x, θ means ÷ then 30 θ 10ɣ 5α 10β20 is
If cot8A = tan(A+8˚), find the value of A? Given that 8A and A+8 are acute angles.
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
...
