An atom is determine to have 17 protons, 18 electrons, and 18 neutrons. What are the mass number and charge of this atom or ion

Mass # = Protons + Neutrons= 35

The charge is -1 because 17 protons arent equal to the 18 electrons each has a -1 charge

Explanation:

Complete question:

A spirit burner used 1.00 g methanol to raise the temperature of 100.0 g water in a metal can from 28.00C to 58.0C. Calculate the heat of combustion of methanol in kJ/mol.

the heat of combustion of the methanol is 402.31 kJ/mol

Explanation:

Given;

mass of water, = 100 g

initial temperature of water, t₁ = 28 ⁰C

final temperature of water, t₂ = 58 ⁰C

specific heat capacity of water = 4.184 J/g⁰C

reacting mass of the methanol, m = 1.00 g

molecular mass of methanol = 32.04 g/mol

number of moles = 1 / 32.04

                             = 0.0312 mol

Apply the principle of conservation of energy;

Therefore, the heat of combustion of the methanol is 402.31 kJ/mol