Answer:
Explanation:
1 Calorie = 4184 Joules
450 Calories = 450 x 4184 J
= 188.28 x 10⁴ J
3.5 x 10⁶ joules
4184 joules = 1 Calorie
3.5 x 10⁶ joules = 836.52 Calories.
Answer:
given an element U of relative atomic mass 10.8 for example with isotopes U-10 and U-11 we can get their percentages by the following steps.
Explanation:
1:let the Percentage of U-10 equal to X% and percentage of U-11equal to Y%.
2:The addition of X% and Y% equal to 100%.
3:X%=100%-Y%
4:X% of U-10 +Y% of U-11=10.8
5: substitute 3 in 4.
6: i.e (100-Y)% of U-10+Y% of U-11=10.8.
7:(100-Y)/100 of 10 +Y/100 of 11=10.8.
8:100-Y/10 +11Y=10.8.
9:(1000-10Y+11Y)/100=10.8.
10:1000+Y=10.8*100
11:1000+Y=1080.
12:Y=1080-1000.
13:Y=80.
14: from 3,X=100%-Y%.
X=100%-80%=20%.
15: Therefore, the percentage of isotopes in the isotopic mixture are 20% U-10 and 80% U-11.
Answer:
H20
Explanation:
H20 (WATER) is a compound because its constituent atoms, oxygen and hydrogen are present in a definite ratio (1:2)
To convert temperature in terms of kelvin to celsius, we subtract 273 to the given temperature in kelvin. In this problem, the given is 49 kelvin, thus, 49 - 273 is equal to -224 degrees celsius. The asnswer is <span>-224 degrees celsius. Kelvin is the SI unit for temperature.</span>