b. gram
c. angstrom
d. nanogram
Answer: B. Metallic (happy to help)
Explanation:
Chromium-50 has 26 neutrons, chromium-52 has 28 neutrons, and chromium-53 has 29 neutrons.
Chromium has an atomic number of 24, which means it has 24 protons. To determine the number of neutrons in each chromium isotope, subtract the atomic number from the mass number. For chromium-50, subtracting 24 from 50 gives you 26 neutrons. For chromium-52, subtracting 24 from 52 gives you 28 neutrons. And for chromium-53, subtracting 24 from 53 gives you 29 neutrons.
#SPJ12
The correct answer is option 2. One way of expressing concentration is by expressing it by parts per million or ppm. It is calculated by dividing the grams of solute and the grams of the solution, and the result is multiplied by 1 000 000. Parts per million is equal to 1 milligram of solute per kilogram of solution.
Answer:
0.9852 moles of CaO
Explanation:
Reaction equation for the decomposition of CaCO₃:
CaCO₃ → CaO + CO₂
The question asks how many moles of CaO form when 98.60g of CaCO₃ decompose.
We can see from the reaction equation that for every mol of CaCO₃, one mol of CaO will be produced (molar ratio 1:1)
_____________________________________________________
So first we need to calculate how many moles are the 98.60g of CaCO₃:
Molar Mass of CaCO₃ = molar mass Ca + molar mass C + 3 * molar mass O
= 40.078 + 12.011 + 3 * 15.999 = 100.086 g/mol
Moles of CaCO₃ = mass CaCO₃ / molar mass CaCO₃
Moles of CaCO₃ = 98.60 g / 100.086 g/mol = 0.9852 moles CaCO₃
________________________________________________________
As we said before for every mol of CaCO₃, one mol of CaO is produced.
So the decomposition of 0.9852 moles of CaCO₃ will produce 0.9852 moles of CaO.
Hey I think it is going to be 0986 moles. Cuz we can see that no. of moles of CaCO3 which will decompose is equivalent to the no. of CaO . Now it's just the matter of finding the no. of moles of CaCO3 .
no.of moles=mass /relative molecular mass
Answer: Chemical Reactions,Acids, and Bases Practice
1. 2Na+Br2--->2NaBr
2. 92.4g
3. Volume of the solution
4. Reacts with metals
5. Exothermic
6. Conserved
The molar mass of CO2 is 28 grams per mole. If you aregiven 2.1 moles of CO2 and you are required to find the grams of this compound,simply multiply 28 grams per mole of CO2 by 2.1 moles of CO2 and you will get 58.8grams of CO2.