Look it up, it’s not that hard.
Answer:
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Molar mass
HNO₃ = 63.02 g/mol
N₂O = 44.013 g/mol
The balanced equation is :
<span>4 Zn + 10 HNO₃ = 4 Zn(NO₃)₂ + N₂O + 5 H₂O
</span>
10 * 63.02 g HNO₃-----------> 44.013 g N₂O
? HNO₃ -----------------> 8.75 g N₂O
Mass HNO₃ = 8.75 * 10 * 63.02 / 44.013
Mass HNO₃ = 125 g
hope this helps!
The reactions based on the absorption and release of the energy are called endothermic and exothermic reactions. The reaction is exothermic.
<h3>What is an exothermic reaction?</h3>
Exothermic reactions are the reaction in which the reactant produces products that release energy from the system to the surroundings. In the reaction bond energy of the reactant is less than the product.
Energy from the system is released in the form of heat, sound, light and electricity. The weak bonds of the compounds are replaced with stronger ones and the standard enthalpy of the reaction is negative.
Therefore, option c. reaction is exothermic is correct.
Learn more about the exothermic reactions here:
brainly.com/question/26616927
Answer: a) 
b) 
Explanation:
a) If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of C = 15.8g
Mass of S= 84.2 g
Step 1 : convert given masses into moles.
Moles of C =
Moles of S=
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = 
For S =
The ratio of C : S = 1:2
Hence the empirical formula is
b) Mass of C= 40 g
Mass of H= 6.7 g
Mass of O = 53.3 g
Step 1 : convert given masses into moles.
Moles of C =
Moles of H =
Moles of O =
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = 
For H = 
For O =
The ratio of C : H: O= 1 :2: 1
Hence the empirical formula is
