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What is the atomic number of CH4?
CH4 is the compound methane. It does NOT have an atomic number. However it has a Relative Molecular Mass (Mr). To calculate its Mr ;- First refer to the Periodic Table for the Atomic Masses of each element present. We have in CH4 ;- 1 x C = 1 x 12 = 12 4 x H = 4 x 1 = 4 12 + 4 = 16 This is the Mr( Relative Molecular Mass ) of methane ; NOT atomic mass.
A car travels west for 240 km in 4 h what is the car's velocity?
The equation for velocity is velocity=distance/time. So you would solve the problem as follows. 240km/4h=60km/h
Tony is 4 years older than Heather and Heather is 5 years younger than Larry If the sum of their ages is 69 how old is Tony?
This is a math problem, and major part of this solution is just translating the sentence form of this problem into equation form. Here's how I would do it. "Tony is 4 years older than Heather" --> H + 4 = T "Heather is 5 yrs younger than Larry" --> H + 5 = L "Sum of their ages is 69" --> H + T + L = 69 So now you have 3 equations and 3 unknowns, which means you can solve the equation by substitution. H + (H+4) + (H+5) = 69 3H + 9 = 69 3H = 60 H = 20. Therefore, T = 24 and L = 25 So, Heather is 20, Tony is 24 and Larry is 25.
What is 25 kilometers to miles per hour?
25 kilometers per hour is 15.53 miles per hour.
N 2 H 4?
N2 + 3H2 -------> 2NH3
