Answer:
D
Explanation:
The weight of an object will change if the object is brought farther away from Earth, or placed on a different planet since the force of gravity on the object will change. However, the mass of the object will remain the same regardless of whether the object is on Earth, in outer space, or on the Moon. hope this helps have a good day :)
Answer:
100 mL
Explanation:
Given data:
Mass of CaCO₃ produced = 2.00 g
Molarity of CaCl₂ = 0.200 M
Volume of CaCl₂ needed = ?
Solution:
Chemical equation:
Na₂CO₃ + CaCl₂ → 2NaCl + CaCO₃
First of all we will calculate the number of moles of CaCO₃.
Number of moles = mass/molar mass
Number of moles = 2.00 g / 100.09 g/mol
Number of moles = 0.02 mol
Now we will compare the moles of CaCO₃ and CaCl₂.
CaCO₃ : CaCl₂
1 : 1
0.02 : 0.02
Thus, 0.02 moles of CaCl₂ react,
Volume of CaCl₂ reacted:
Molarity = number of moles / volume in L
0.200 M = 0.02 mol / volume in L
Volume in L = 0.02 mol / 0.200 M
Volume in L = 0.1 L
Volume in mL:
0.1 L × 1000 mL/1L
100 mL
The reason why some water and heat are added after Mg ribbon is reacted completely with air is to remove Mg3N2 as MgO.
Combustion reaction is a reaction in which a substance is completely burnt in oxygen. Magnesium ribbon can be converted to magnesium oxide by combustion in air.
The reaction is as follows; 2Mg(s) + O2 ----> 2MgO(s)
Since air contains nitrogen, Mg3N2 is also formed. Heat and water can be added to the reaction thereby converting magnesium nitride to magnesium oxide.
Learn more: brainly.com/question/11527546
Chemical formulas are used to describe the types of atoms and their numbers in an element or compound. The atoms of each element are represented by one or two different letters. When more than one atom of a specific element is found in a molecule, a subscript is used to indicate this in the chemical formula.
I believe its 10^23 u r saying
then no. of moles= 9.03*10^23/6.02*10^23=1.5mole